N42.32 ICD-10-CM Code: Atypical small acinar proliferation of prostate
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the genitourinary system (N00-N99) / Diseases of male genital organs (N40-N53)
N42.32
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceAtypical small acinar proliferation of prostate
A microscopic finding on prostate biopsy showing small clusters of abnormal cells that are difficult to classify and may indicate increased cancer risk.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for N42.32 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for N42.32 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for N42.32 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for N42.32 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for N42.32 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for N42.32 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for N42.32 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is N42.32 an HCC code?
No. N42.32 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- N42.32
- Description
- Atypical small acinar proliferation of prostate
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
N42.32 is the ICD-10-CM diagnosis code for atypical small acinar proliferation of prostate. A microscopic finding on prostate biopsy showing small clusters of abnormal cells that are difficult to classify and may indicate increased cancer risk. N42.32 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering diseases of male genital organs (n40-n53).
N42.32 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
ASAP is a diagnostic challenge requiring expert pathology review and clinical correlation.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for N42.32 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •ASAP is a diagnostic challenge requiring expert pathology review and clinical correlation
- •Ensure pathology report explicitly documents ASAP diagnosis before coding