Mierau Medical Diagnostic and Coding Method
Postulate 4 Primacy of Medical Reality
Statement
Medical reality SHALL take precedence over its interpretation, documentation, representation, or classification.
Definition
Medical Reality refers to the actual medical condition or state of a patient, insofar as it can be established through appropriate observation, examination, investigation, and clinical assessment.
Its documentation, interpretation, diagnostic designation, and classification are representations of that reality and SHALL NOT be treated as identical to the reality itself.
Principle
The representation of a medical condition SHALL never take precedence over the medical reality it is intended to represent.
A recorded diagnosis, finding, classification, code, or previous clinical assessment is therefore information about medical reality, not medical reality itself.
Subsequent diagnostic reasoning SHALL remain open to the possibility that an existing representation is incomplete, inaccurate, outdated, or based on insufficient information.
Rationale
Medical knowledge is necessarily mediated through observations, investigations, interpretations, diagnoses, documentation, and classifications.
Each of these can contain limitations.
A diagnosis may have been based on limited information.
An investigation may have addressed a different question than the one later being asked.
A classification may accurately represent what was documented while the underlying medical interpretation remains uncertain.
The distinction is therefore fundamental
What is recorded is not necessarily identical to what is medically real.
This principle is particularly important in longitudinal medical records. A previously documented diagnosis can become part of the information available to subsequent clinicians and may therefore influence later diagnostic reasoning.
The existence of a previous diagnosis SHALL NOT by itself establish the underlying medical reality.
Practical Example
A patient reports persistent pain in the right lateral thigh.
A previous medical record contains a diagnosis of a somatic pain disorder.
Under this postulate, the existence of that diagnosis does not establish that the patient's pain is caused by a somatic disorder.
It is initially a previous medical interpretation that must be considered alongside the other available information.
If subsequent investigation produces new evidence, the medical interpretation may need to change.
Our previous example illustrates the same principle from another direction:
A series of conventional examinations may fail to demonstrate a relevant abnormality. A later functional investigation may reveal a previously unrecognised finding.
The earlier negative findings remain genuine findings of those investigations; they do not become proof that the underlying medical reality was absent.
Database Requirements
The database SHALL distinguish between
- medical observation / finding
- interpretation
- diagnostic assessment
- classification / coding
A recorded diagnosis SHALL therefore not be stored in a way that makes it indistinguishable from an independently established medical finding.
The database SHOULD preserve the source, date, status, and evidentiary basis of an assessment so that later users can determine what represents an observation and what represents an interpretation.
Implications
This principle means that
- a diagnosis is not itself proof of its correctness;
- a code is not proof of a diagnosis;
- a previous clinical assessment is not proof of current medical reality;
- an absence of a finding in one investigation is not necessarily proof of absence of the underlying condition;
- later evidence may legitimately change the interpretation of earlier information.
The principle therefore protects the diagnostic process against reification: treating a representation as though it were the reality itself.
Related Postulates
P1 — Postulate of Initial Event
ensures that the diagnostic process begins without prematurely assigning medical meaning to the Initial Event.
P2 — Wide Band Scan Principle
reduces premature restriction of the diagnostic search space.
P3 — Progressive Diagnostic Rendering
distinguishes the information obtained at different levels of diagnostic resolution.
P5 — Separation of Diagnosis and Classification
explicitly separates medical diagnosis from its subsequent classification.
P9 — Evidence Principle
provides the basis for assessing the evidentiary strength of medical information.
Key Message
The record represents medical reality. It is not medical reality itself.
Mierau Medical Diagnostic and Coding Method
Postulate 4 Primacy of Medical Reality
Statement
Medical reality SHALL take precedence over its interpretation, documentation, representation, or classification.
Definition
Medical Reality refers to the actual medical condition or state of a patient, insofar as it can be established through appropriate observation, examination, investigation, and clinical assessment.
Its documentation, interpretation, diagnostic designation, and classification are representations of that reality and SHALL NOT be treated as identical to the reality itself.
Principle
The representation of a medical condition SHALL never take precedence over the medical reality it is intended to represent.
A recorded diagnosis, finding, classification, code, or previous clinical assessment is therefore information about medical reality, not medical reality itself.
Subsequent diagnostic reasoning SHALL remain open to the possibility that an existing representation is incomplete, inaccurate, outdated, or based on insufficient information.
Rationale
Medical knowledge is necessarily mediated through observations, investigations, interpretations, diagnoses, documentation, and classifications.
Each of these can contain limitations.
A diagnosis may have been based on limited information.
An investigation may have addressed a different question than the one later being asked.
A classification may accurately represent what was documented while the underlying medical interpretation remains uncertain.
The distinction is therefore fundamental
What is recorded is not necessarily identical to what is medically real.
This principle is particularly important in longitudinal medical records. A previously documented diagnosis can become part of the information available to subsequent clinicians and may therefore influence later diagnostic reasoning.
The existence of a previous diagnosis SHALL NOT by itself establish the underlying medical reality.
Practical Example
A patient reports persistent pain in the right lateral thigh.
A previous medical record contains a diagnosis of a somatic pain disorder.
Under this postulate, the existence of that diagnosis does not establish that the patient's pain is caused by a somatic disorder.
It is initially a previous medical interpretation that must be considered alongside the other available information.
If subsequent investigation produces new evidence, the medical interpretation may need to change.
Our previous example illustrates the same principle from another direction:
A series of conventional examinations may fail to demonstrate a relevant abnormality. A later functional investigation may reveal a previously unrecognised finding.
The earlier negative findings remain genuine findings of those investigations; they do not become proof that the underlying medical reality was absent.
Database Requirements
The database SHALL distinguish between
- medical observation / finding
- interpretation
- diagnostic assessment
- classification / coding
A recorded diagnosis SHALL therefore not be stored in a way that makes it indistinguishable from an independently established medical finding.
The database SHOULD preserve the source, date, status, and evidentiary basis of an assessment so that later users can determine what represents an observation and what represents an interpretation.
Implications
This principle means that
- a diagnosis is not itself proof of its correctness;
- a code is not proof of a diagnosis;
- a previous clinical assessment is not proof of current medical reality;
- an absence of a finding in one investigation is not necessarily proof of absence of the underlying condition;
- later evidence may legitimately change the interpretation of earlier information.
The principle therefore protects the diagnostic process against reification: treating a representation as though it were the reality itself.
Related Postulates
P1 — Postulate of Initial Event
ensures that the diagnostic process begins without prematurely assigning medical meaning to the Initial Event.
P2 — Wide Band Scan Principle
reduces premature restriction of the diagnostic search space.
P3 — Progressive Diagnostic Rendering
distinguishes the information obtained at different levels of diagnostic resolution.
P5 — Separation of Diagnosis and Classification
explicitly separates medical diagnosis from its subsequent classification.
P9 — Evidence Principle
provides the basis for assessing the evidentiary strength of medical information.
Key Message
The record represents medical reality. It is not medical reality itself.
Mierau Medical Diagnostic and Coding Method
Postulate 4 Primacy of Medical Reality
Statement
Medical reality SHALL take precedence over its interpretation, documentation, representation, or classification.
Definition
Medical Reality refers to the actual medical condition or state of a patient, insofar as it can be established through appropriate observation, examination, investigation, and clinical assessment.
Its documentation, interpretation, diagnostic designation, and classification are representations of that reality and SHALL NOT be treated as identical to the reality itself.
Principle
The representation of a medical condition SHALL never take precedence over the medical reality it is intended to represent.
A recorded diagnosis, finding, classification, code, or previous clinical assessment is therefore information about medical reality, not medical reality itself.
Subsequent diagnostic reasoning SHALL remain open to the possibility that an existing representation is incomplete, inaccurate, outdated, or based on insufficient information.
Rationale
Medical knowledge is necessarily mediated through observations, investigations, interpretations, diagnoses, documentation, and classifications.
Each of these can contain limitations.
A diagnosis may have been based on limited information.
An investigation may have addressed a different question than the one later being asked.
A classification may accurately represent what was documented while the underlying medical interpretation remains uncertain.
The distinction is therefore fundamental
What is recorded is not necessarily identical to what is medically real.
This principle is particularly important in longitudinal medical records. A previously documented diagnosis can become part of the information available to subsequent clinicians and may therefore influence later diagnostic reasoning.
The existence of a previous diagnosis SHALL NOT by itself establish the underlying medical reality.
Practical Example
A patient reports persistent pain in the right lateral thigh.
A previous medical record contains a diagnosis of a somatic pain disorder.
Under this postulate, the existence of that diagnosis does not establish that the patient's pain is caused by a somatic disorder.
It is initially a previous medical interpretation that must be considered alongside the other available information.
If subsequent investigation produces new evidence, the medical interpretation may need to change.
Our previous example illustrates the same principle from another direction:
A series of conventional examinations may fail to demonstrate a relevant abnormality. A later functional investigation may reveal a previously unrecognised finding.
The earlier negative findings remain genuine findings of those investigations; they do not become proof that the underlying medical reality was absent.
Database Requirements
The database SHALL distinguish between
- medical observation / finding
- interpretation
- diagnostic assessment
- classification / coding
A recorded diagnosis SHALL therefore not be stored in a way that makes it indistinguishable from an independently established medical finding.
The database SHOULD preserve the source, date, status, and evidentiary basis of an assessment so that later users can determine what represents an observation and what represents an interpretation.
Implications
This principle means that
- a diagnosis is not itself proof of its correctness;
- a code is not proof of a diagnosis;
- a previous clinical assessment is not proof of current medical reality;
- an absence of a finding in one investigation is not necessarily proof of absence of the underlying condition;
- later evidence may legitimately change the interpretation of earlier information.
The principle therefore protects the diagnostic process against reification: treating a representation as though it were the reality itself.
Related Postulates
P1 — Postulate of Initial Event
ensures that the diagnostic process begins without prematurely assigning medical meaning to the Initial Event.
P2 — Wide Band Scan Principle
reduces premature restriction of the diagnostic search space.
P3 — Progressive Diagnostic Rendering
distinguishes the information obtained at different levels of diagnostic resolution.
P5 — Separation of Diagnosis and Classification
explicitly separates medical diagnosis from its subsequent classification.
P9 — Evidence Principle
provides the basis for assessing the evidentiary strength of medical information.
Key Message
The record represents medical reality. It is not medical reality itself.
Mierau Medical Diagnostic and Coding Method
Postulate 4 Primacy of Medical Reality
Statement
Medical reality SHALL take precedence over its interpretation, documentation, representation, or classification.
Definition
Medical Reality refers to the actual medical condition or state of a patient, insofar as it can be established through appropriate observation, examination, investigation, and clinical assessment.
Its documentation, interpretation, diagnostic designation, and classification are representations of that reality and SHALL NOT be treated as identical to the reality itself.
Principle
The representation of a medical condition SHALL never take precedence over the medical reality it is intended to represent.
A recorded diagnosis, finding, classification, code, or previous clinical assessment is therefore information about medical reality, not medical reality itself.
Subsequent diagnostic reasoning SHALL remain open to the possibility that an existing representation is incomplete, inaccurate, outdated, or based on insufficient information.
Rationale
Medical knowledge is necessarily mediated through observations, investigations, interpretations, diagnoses, documentation, and classifications.
Each of these can contain limitations.
A diagnosis may have been based on limited information.
An investigation may have addressed a different question than the one later being asked.
A classification may accurately represent what was documented while the underlying medical interpretation remains uncertain.
The distinction is therefore fundamental
What is recorded is not necessarily identical to what is medically real.
This principle is particularly important in longitudinal medical records. A previously documented diagnosis can become part of the information available to subsequent clinicians and may therefore influence later diagnostic reasoning.
The existence of a previous diagnosis SHALL NOT by itself establish the underlying medical reality.
Practical Example
A patient reports persistent pain in the right lateral thigh.
A previous medical record contains a diagnosis of a somatic pain disorder.
Under this postulate, the existence of that diagnosis does not establish that the patient's pain is caused by a somatic disorder.
It is initially a previous medical interpretation that must be considered alongside the other available information.
If subsequent investigation produces new evidence, the medical interpretation may need to change.
Our previous example illustrates the same principle from another direction:
A series of conventional examinations may fail to demonstrate a relevant abnormality. A later functional investigation may reveal a previously unrecognised finding.
The earlier negative findings remain genuine findings of those investigations; they do not become proof that the underlying medical reality was absent.
Database Requirements
The database SHALL distinguish between
- medical observation / finding
- interpretation
- diagnostic assessment
- classification / coding
A recorded diagnosis SHALL therefore not be stored in a way that makes it indistinguishable from an independently established medical finding.
The database SHOULD preserve the source, date, status, and evidentiary basis of an assessment so that later users can determine what represents an observation and what represents an interpretation.
Implications
This principle means that
- a diagnosis is not itself proof of its correctness;
- a code is not proof of a diagnosis;
- a previous clinical assessment is not proof of current medical reality;
- an absence of a finding in one investigation is not necessarily proof of absence of the underlying condition;
- later evidence may legitimately change the interpretation of earlier information.
The principle therefore protects the diagnostic process against reification: treating a representation as though it were the reality itself.
Related Postulates
P1 — Postulate of Initial Event
ensures that the diagnostic process begins without prematurely assigning medical meaning to the Initial Event.
P2 — Wide Band Scan Principle
reduces premature restriction of the diagnostic search space.
P3 — Progressive Diagnostic Rendering
distinguishes the information obtained at different levels of diagnostic resolution.
P5 — Separation of Diagnosis and Classification
explicitly separates medical diagnosis from its subsequent classification.
P9 — Evidence Principle
provides the basis for assessing the evidentiary strength of medical information.
Key Message
The record represents medical reality. It is not medical reality itself.
Mierau Medical Diagnostic and Coding Method
Postulate 4 Primacy of Medical Reality
Statement
Medical reality SHALL take precedence over its interpretation, documentation, representation, or classification.
Definition
Medical Reality refers to the actual medical condition or state of a patient, insofar as it can be established through appropriate observation, examination, investigation, and clinical assessment.
Its documentation, interpretation, diagnostic designation, and classification are representations of that reality and SHALL NOT be treated as identical to the reality itself.
Principle
The representation of a medical condition SHALL never take precedence over the medical reality it is intended to represent.
A recorded diagnosis, finding, classification, code, or previous clinical assessment is therefore information about medical reality, not medical reality itself.
Subsequent diagnostic reasoning SHALL remain open to the possibility that an existing representation is incomplete, inaccurate, outdated, or based on insufficient information.
Rationale
Medical knowledge is necessarily mediated through observations, investigations, interpretations, diagnoses, documentation, and classifications.
Each of these can contain limitations.
A diagnosis may have been based on limited information.
An investigation may have addressed a different question than the one later being asked.
A classification may accurately represent what was documented while the underlying medical interpretation remains uncertain.
The distinction is therefore fundamental
What is recorded is not necessarily identical to what is medically real.
This principle is particularly important in longitudinal medical records. A previously documented diagnosis can become part of the information available to subsequent clinicians and may therefore influence later diagnostic reasoning.
The existence of a previous diagnosis SHALL NOT by itself establish the underlying medical reality.
Practical Example
A patient reports persistent pain in the right lateral thigh.
A previous medical record contains a diagnosis of a somatic pain disorder.
Under this postulate, the existence of that diagnosis does not establish that the patient's pain is caused by a somatic disorder.
It is initially a previous medical interpretation that must be considered alongside the other available information.
If subsequent investigation produces new evidence, the medical interpretation may need to change.
Our previous example illustrates the same principle from another direction:
A series of conventional examinations may fail to demonstrate a relevant abnormality. A later functional investigation may reveal a previously unrecognised finding.
The earlier negative findings remain genuine findings of those investigations; they do not become proof that the underlying medical reality was absent.
Database Requirements
The database SHALL distinguish between
- medical observation / finding
- interpretation
- diagnostic assessment
- classification / coding
A recorded diagnosis SHALL therefore not be stored in a way that makes it indistinguishable from an independently established medical finding.
The database SHOULD preserve the source, date, status, and evidentiary basis of an assessment so that later users can determine what represents an observation and what represents an interpretation.
Implications
This principle means that
- a diagnosis is not itself proof of its correctness;
- a code is not proof of a diagnosis;
- a previous clinical assessment is not proof of current medical reality;
- an absence of a finding in one investigation is not necessarily proof of absence of the underlying condition;
- later evidence may legitimately change the interpretation of earlier information.
The principle therefore protects the diagnostic process against reification: treating a representation as though it were the reality itself.
Related Postulates
P1 — Postulate of Initial Event
ensures that the diagnostic process begins without prematurely assigning medical meaning to the Initial Event.
P2 — Wide Band Scan Principle
reduces premature restriction of the diagnostic search space.
P3 — Progressive Diagnostic Rendering
distinguishes the information obtained at different levels of diagnostic resolution.
P5 — Separation of Diagnosis and Classification
explicitly separates medical diagnosis from its subsequent classification.
P9 — Evidence Principle
provides the basis for assessing the evidentiary strength of medical information.
Key Message
The record represents medical reality. It is not medical reality itself.
Mierau Medical Diagnostic and Coding Method
Postulate 4 Primacy of Medical Reality
Statement
Medical reality SHALL take precedence over its interpretation, documentation, representation, or classification.
Definition
Medical Reality refers to the actual medical condition or state of a patient, insofar as it can be established through appropriate observation, examination, investigation, and clinical assessment.
Its documentation, interpretation, diagnostic designation, and classification are representations of that reality and SHALL NOT be treated as identical to the reality itself.
Principle
The representation of a medical condition SHALL never take precedence over the medical reality it is intended to represent.
A recorded diagnosis, finding, classification, code, or previous clinical assessment is therefore information about medical reality, not medical reality itself.
Subsequent diagnostic reasoning SHALL remain open to the possibility that an existing representation is incomplete, inaccurate, outdated, or based on insufficient information.
Rationale
Medical knowledge is necessarily mediated through observations, investigations, interpretations, diagnoses, documentation, and classifications.
Each of these can contain limitations.
A diagnosis may have been based on limited information.
An investigation may have addressed a different question than the one later being asked.
A classification may accurately represent what was documented while the underlying medical interpretation remains uncertain.
The distinction is therefore fundamental
What is recorded is not necessarily identical to what is medically real.
This principle is particularly important in longitudinal medical records. A previously documented diagnosis can become part of the information available to subsequent clinicians and may therefore influence later diagnostic reasoning.
The existence of a previous diagnosis SHALL NOT by itself establish the underlying medical reality.
Practical Example
A patient reports persistent pain in the right lateral thigh.
A previous medical record contains a diagnosis of a somatic pain disorder.
Under this postulate, the existence of that diagnosis does not establish that the patient's pain is caused by a somatic disorder.
It is initially a previous medical interpretation that must be considered alongside the other available information.
If subsequent investigation produces new evidence, the medical interpretation may need to change.
Our previous example illustrates the same principle from another direction:
A series of conventional examinations may fail to demonstrate a relevant abnormality. A later functional investigation may reveal a previously unrecognised finding.
The earlier negative findings remain genuine findings of those investigations; they do not become proof that the underlying medical reality was absent.
Database Requirements
The database SHALL distinguish between
- medical observation / finding
- interpretation
- diagnostic assessment
- classification / coding
A recorded diagnosis SHALL therefore not be stored in a way that makes it indistinguishable from an independently established medical finding.
The database SHOULD preserve the source, date, status, and evidentiary basis of an assessment so that later users can determine what represents an observation and what represents an interpretation.
Implications
This principle means that
- a diagnosis is not itself proof of its correctness;
- a code is not proof of a diagnosis;
- a previous clinical assessment is not proof of current medical reality;
- an absence of a finding in one investigation is not necessarily proof of absence of the underlying condition;
- later evidence may legitimately change the interpretation of earlier information.
The principle therefore protects the diagnostic process against reification: treating a representation as though it were the reality itself.
Related Postulates
P1 — Postulate of Initial Event
ensures that the diagnostic process begins without prematurely assigning medical meaning to the Initial Event.
P2 — Wide Band Scan Principle
reduces premature restriction of the diagnostic search space.
P3 — Progressive Diagnostic Rendering
distinguishes the information obtained at different levels of diagnostic resolution.
P5 — Separation of Diagnosis and Classification
explicitly separates medical diagnosis from its subsequent classification.
P9 — Evidence Principle
provides the basis for assessing the evidentiary strength of medical information.
Key Message
The record represents medical reality. It is not medical reality itself.