AHA Coding Clinic® for ICD-9 - 2011 Issue 1; Ask the Editor
Trichilemmal (Pilar) Cyst
The patient presents for outpatient surgery for removal of a scalp lesion. The provider documented "skin lesion, scalp - excised." The pathology report indicates "trichilemmal cyst (pilar cyst)." ICD-9-CM classifies a cyst of the scalp as a sebaceous cyst. There is confusion as to whether this should be coded as a trichilemmal or sebaceous cyst. What is the correct diagnosis code for this encounter? ...
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Article Overview
This premium coding article discusses diagnosis coding for a scalp cyst found on pathology after outpatient excision. It focuses on ICD-9-CM classification, clarifies the terminology used for trichilemmal (pilar) cysts, and explains why these lesions may be confused with other cyst terms in clinical documentation and pathology reporting. The content is relevant to coders, billers, auditors, and clinicians working with dermatology, pathology, and outpatient surgery documentation.
Why This Topic Matters
Accurate diagnosis classification affects claims, medical record consistency, and communication between pathology and coding documentation. This topic is especially relevant when source documents use overlapping cyst terminology that can lead to coding confusion.
What You Will Learn
- How this scalp cyst topic is classified within ICD-9-CM
- Why terminology from pathology and clinical documentation can create coding ambiguity
- Which general diagnosis category the article addresses for this encounter
- How the article frames the relationship between trichilemmal and related cyst terminology
Who Should Read This
- Medical coders
- Coding auditors
- Billing staff
- Dermatology practices
- Pathology staff
- Outpatient surgery staff
Codes Discussed
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