AHA Coding Clinic® for ICD-9 - 1984 May - June
Principal and Other Diagnoses Delineated
The Central Office on ICD-9-CM has received requests for clarification of the terms principal diagnosis and secondary diagnoses used in the Final Rules on Prospective Payment for Medicare Inpatient Hospital Services published by the Health Care Financing Administration (HCFA). Requests have also been received for clarification of the phrase "after study," which appears in the definition for principal diagnosis in the Uniform Hospital Discharge Data Set (UHDDS). In answer to these requests, the following information and guidelines have been prepared by the Central Office on ICD-9-CM for use in reporting clinical data. The UHDDS, which was prepared under...
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Article Overview
This article addresses long-standing questions about how inpatient hospital diagnoses are classified under ICD-9-CM and the Uniform Hospital Discharge Data Set (UHDDS). It discusses the meaning of principal diagnosis, secondary diagnoses, and related hospital reporting terms, along with the general framework used for procedure reporting and DRG-oriented data collection. The content is aimed at coding professionals who need to understand the reporting terminology and guidance sources that support inpatient abstracting and diagnosis selection.
Why This Topic Matters
Accurate inpatient diagnosis reporting affects the quality of clinical data, hospital coding consistency, and downstream payment or grouping processes. This guidance helps coders and record abstractors understand the terminology used in official reporting standards and related Medicare inpatient references.
Article Sections
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Background and purpose
Introduces the questions that prompted the guidance and identifies the national reporting and classification sources involved. It frames the article as clarification for inpatient clinical data reporting.
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UHDDS diagnosis definitions
Summarizes the general inpatient reporting framework for diagnoses and distinguishes principal diagnosis from other diagnoses. It also notes which diagnoses are considered outside the current hospital stay.
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UHDDS procedure reporting
Describes the general reporting approach for significant procedures and the idea of a principal procedure. It outlines the broad criteria used within the UHDDS context.
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Secondary diagnoses and DRG context
Explains how the term secondary diagnoses is used in the Medicare inpatient prospective payment context and how it relates to comorbidity and complications. It also notes the relationship to DRG review and coding practice.
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Meaning of "after study"
Clarifies the phrase used in the principal diagnosis definition by describing the types of evaluation that may contribute to the final determination. It discusses how the final condition may compare with the admitting diagnosis.
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Example and update note
Presents an illustrative inpatient case and a later note tied to a diagnosis code update. The section supports the article's clarification of reporting questions with an example and historical coding note.
What You Will Learn
- How the article frames principal diagnosis and secondary diagnosis terminology in inpatient reporting
- What UHDDS contributes to hospital discharge data definitions
- How broad procedure-reporting concepts are described in the guidance
- Why DRG-related review is mentioned in the context of diagnosis and procedure reporting
- How the article explains the phrase associated with principal diagnosis determination
- What types of example material and update notes appear in the article
Who Should Read This
- ICD-9-CM coders
- Inpatient hospital coders
- Clinical data abstractors
- Health information management professionals
- DRG-oriented coding staff
Codes Discussed
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