D03.8 ICD-10-CM Code: Melanoma in situ of other sites
D03.8 maps to CMS-HCC V28 23. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Neoplasms (C00-D49) / In situ neoplasms (D00-D09)
D03.8
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceMelanoma in situ of other sites
Early stage melanoma (cancer cells) found on the skin at locations not specified elsewhere, such as the scalp, trunk, or other body areas.
Buddy Insight
Melanoma in situ of other sites captures early melanocytic malignancy at body locations not classified in the more specific D03 subcategories, such as the genitalia, perineum, or other uncommon anatomical sites.
CMS-HCC V28
MappedHCC 23
Code-level coefficient reference
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 013
Code-level coefficient reference
ESRD/PACE
MappedHCC 12
Code-level coefficient reference
RXHCC
MappedHCC 22
Code-level coefficient reference
Code Book Path
Inclusion Terms
Official- Melanoma in situ of scrotum
Excludes 2
OfficialNo Excludes 2 notes are included in this display for D03.8. Check the code and parent instructions in the Code Book.
Related Codes
Includes
Official- Bowen's diseaseInherited from D00-D09
- erythroplasiaInherited from D00-D09
- grade III intraepithelial neoplasiaInherited from D00-D09
- Queyrat's erythroplasiaInherited from D00-D09
Excludes 1
Official- carcinoma in situ of scrotum (D07.61)
Code First
OfficialNo Code First sequencing instructions are included in this display for D03.8. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for D03.8. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for D03.8. 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 D03.8 an HCC code?
Yes. D03.8 (Melanoma in situ of other sites) maps to HCC 23, Prostate, Breast, and Other Cancers and Tumors under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.186. 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: D03.8 is billable and maps to V28 HCC 23, Prostate, Breast, and Other Cancers and Tumors. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- D03.8
- Description
- Melanoma in situ of other sites
- HCC (V28)
- HCC 23 — Prostate, Breast, and Other Cancers and Tumors
- RAF reference coefficient
- 0.186
- 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 D03.8 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for D03.8
For D03.8, 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
D03.8 is the ICD-10-CM diagnosis code for melanoma in situ of other sites. Early stage melanoma (cancer cells) found on the skin at locations not specified elsewhere, such as the scalp, trunk, or other body areas. D03.8 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering in situ neoplasms (d00-d09).
Under the CMS-HCC V28 risk adjustment model, D03.8 maps to Prostate, Breast, and Other Cancers and Tumors (HCC 23) with a source-labeled community, non-dual, aged reference coefficient of 0.186. No V24 mapping is shown for D03.8; 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.
Use this code only when the melanoma in situ site does not fit into more specific D03 subcategories. For D03.8, 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 D03.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the melanoma in situ site does not fit into more specific D03 subcategories
- •Document the specific anatomical location in the medical record for clarity and future reference
Clinical Significance
Melanoma in situ of other sites captures early melanocytic malignancy at body locations not classified in the more specific D03 subcategories, such as the genitalia, perineum, or other uncommon anatomical sites. These atypical locations may present diagnostic challenges due to their rarity and the provider's lower clinical suspicion for melanoma at these sites. Complete excision is curative at the in situ stage.
Documentation Requirements
- ✓Biopsy confirmation with pathology documenting melanoma in situ and the specific anatomical site.
- ✓The documentation must clearly show that the site does not correspond to a more specific D03 code (lip, eyelid, ear, face, scalp/neck, trunk, or extremity).
- ✓Include margin status and follow-up surveillance plan.
Excludes 1, Do NOT code together
- carcinoma in situ of scrotum (D07.61)