C51.2 ICD-10-CM Code: Malignant neoplasm of clitoris
C51.2 maps to CMS-HCC V28 22. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC coding software
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FY 2026 Apr update / Neoplasms (C00-D49) / Malignant neoplasms of female genital organs (C51-C58)
C51.2
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceMalignant neoplasm of clitoris
Cancer that occurs in the clitoris, a sensitive part of the female external genitalia.
Buddy Insight
Malignant neoplasm of the clitoris is a rare vulvar cancer subsite that carries significant surgical and psychosocial implications.
CMS-HCC V28
MappedHCC 22
Code-level coefficient reference
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 012
Code-level coefficient reference
ESRD/PACE
MappedHCC 11
Code-level coefficient reference
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for C51.2. Check the code and parent instructions in the Code Book.
Excludes 2
OfficialNo Excludes 2 notes are included in this display for C51.2. Check the code and parent instructions in the Code Book.
Related Codes
Includes
Official- malignant neoplasm of skin of female genital organsInherited from C51-C58
Excludes 1
Official- carcinoma in situ of vulva (D07.1)Inherited from C51
Code First
OfficialNo Code First sequencing instructions are included in this display for C51.2. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for C51.2. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for C51.2. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
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 C51.2 an HCC code?
Yes. C51.2 (Malignant neoplasm of clitoris) maps to HCC 22, Bladder, Colorectal, and Other Cancers under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.363. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.
Coder answer: C51.2 is billable and maps to V28 HCC 22, Bladder, Colorectal, and Other Cancers. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- C51.2
- Description
- Malignant neoplasm of clitoris
- HCC (V28)
- HCC 22 — Bladder, Colorectal, and Other Cancers
- RAF reference coefficient
- 0.363
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.
Work C51.2 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for C51.2
For C51.2, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Coder workflow notes
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What This Code Means
C51.2 is the ICD-10-CM diagnosis code for malignant neoplasm of clitoris. Cancer that occurs in the clitoris, a sensitive part of the female external genitalia. C51.2 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of female genital organs (c51-c58).
Under the CMS-HCC V28 risk adjustment model, C51.2 maps to Bladder, Colorectal, and Other Cancers (HCC 22) with a source-labeled community, non-dual, aged reference coefficient of 0.363. No V24 mapping is shown for C51.2; use the applicable model and payment year when reviewing the V28 mapping. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.
This is a rare site; ensure documentation clearly specifies clitoral involvement. For C51.2, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for C51.2 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a rare site; ensure documentation clearly specifies clitoral involvement
- •Verify staging information as clitoral tumors may have different prognostic implications
Clinical Significance
Malignant neoplasm of the clitoris is a rare vulvar cancer subsite that carries significant surgical and psychosocial implications. Due to the anatomical and functional importance of the clitoris, treatment planning must balance oncological adequacy with quality of life considerations. This diagnosis requires multidisciplinary team involvement.
Documentation Requirements
- ✓Specific anatomical site confirmed as clitoris
- ✓Histological type and grade
- ✓Tumor size and depth of invasion
- ✓TNM staging
- ✓Lymph node assessment (inguinofemoral)
- ✓Extension to adjacent structures (urethra, vagina) documented
- ✓Surgical approach documented (partial vs. total clitorectomy)
Commonly Confused Codes
- •C51.0: Malignant neoplasm of labium majus; different vulvar structure
- •C51.1: Malignant neoplasm of labium minus; adjacent but anatomically distinct
- •C51.8: Overlapping sites of vulva; use when tumor extends beyond the clitoris to involve other vulvar structures
- •C51.9: Vulva unspecified; use only when the specific structure is not identified