AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2022 Issue 4; New/Revised ICD-10-CM Codes
PTEN Hamartoma Tumor Syndrome, Cowden Syndrome, and von Hippel-Lindau Syndrome
Code Q85.8, Other phakomatoses, not elsewhere classified, was expanded and unique codes have been created to describe PTEN tumor syndrome (Q85.81), other Cowden syndrome (Q85.82), and von Hippel-Lindau syndrome (Q85.83). PTEN hamartoma tumor syndrome (PHTS) is an uncommon condition that includes a spectrum of disorders caused by a germline heterozygous loss-of-function mutation in the Phosphatase and Tensin Homolog (PTEN) tumor suppressor gene. The syndrome is characterized by multiple hamartomas (benign tumors) that can affect various areas of the body. Estimating the prevalence of PHTS is difficult, because of the varied clinical presentations, and signs...
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Article Overview
This article explains a set of ICD-10-CM changes affecting rare genetic syndromes within the phakomatoses category. It is useful for coders, clinicians, and revenue cycle teams who need to recognize the affected diagnoses, understand the general clinical context, and see how the article frames documentation and coding considerations for these conditions. The discussion also includes a brief clinic-based example showing the kinds of related manifestations that may be documented alongside the primary syndrome diagnosis.
Why This Topic Matters
Accurate recognition of these rare hereditary syndromes supports cleaner documentation, better longitudinal tracking, and more consistent diagnosis coding across clinical settings. The article is especially relevant to users monitoring ICD-10-CM updates and coding rare genetic or multisystem conditions.
What You Will Learn
- Which rare genetic syndromes are addressed in the ICD-10-CM update
- How the article situates these diagnoses within the phakomatoses category
- What general clinical features are associated with the syndromes discussed
- Why these diagnosis updates may matter for care tracking and documentation
- How the article presents a brief example of coding related manifestations in a patient visit
Who Should Read This
- Medical coders
- Coding auditors
- Clinical documentation specialists
- Physicians and advanced practice providers
- Revenue cycle and compliance teams
Codes Discussed
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