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ICD-10-CM reference

ICD-10-CM code search with HCC risk adjustment mapping

Search the full 74,000-code FY2026 ICD-10-CM tabular list. Every billable code shows its CMS-HCC V28 and V24 mapping, CMS-HCC V28 PY2026 calculator, MEAT documentation requirements, and common coding pitfalls. Built for risk adjustment coders working in Medicare Advantage who need faster lookups without encoder bloat.

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Most-coded HCC conditions

Start with the conditions that drive the largest share of risk adjustment factor scores in Medicare Advantage panels.

ICD-10-CM chapters

The FY2026 ICD-10-CM tabular list is organized into 22 chapters. Open any chapter to see how many of its codes risk-adjust under CMS-HCC V28, the HCC categories they map to, and the member codes.

Browse all 22 chapters

Code families with their CMS-HCC V28 status

The categories coders look up most, each with every child code in one table: FY2026 billability, the V28 category it maps to, and the codes that carry no HCC.

Frequently asked questions

What is ICD-10-CM and how does it relate to HCC coding?
ICD-10-CM is the diagnosis code set used in the United States for outpatient and physician billing. CMS-HCC risk adjustment models (V28 and V24) take a subset of ICD-10-CM codes and group them into Hierarchical Condition Categories (HCCs) that drive Medicare Advantage payment. Every billable ICD-10-CM code on HCC Buddy shows its V28 HCC category, V24 HCC category, CMS-HCC V28 PY2026 calculator, and MEAT documentation requirements so coders can capture the conditions that affect risk adjustment factor scores.
How many ICD-10-CM codes are billable for HCC in 2026?
The FY2026 ICD-10-CM tabular list contains roughly 74,000 codes, of which about 8,000 map to a CMS-HCC V28 payment category. The remaining codes are still billable for diagnosis but do not contribute to the patient's RAF score under risk adjustment. HCC Buddy filters and surfaces the HCC-mapped subset for every search so coders see payment-relevant codes first.
Is the ICD-10 search free to use?
Yes. ICD-10 code search and HCC mapping are free with a HCC Buddy account. The RAF Calculator supports CMS-HCC V28 PY2026 with complete member context and shows no score unless every required source and calculation check passes. Other Pro features (Ask Buddy, code basket exports, drug-to-diagnosis lookup, and the Chrome extension) require a Pro subscription with a 7-day free trial, no card required. The tools are built for coding inputs such as ICD-10 codes, HCC selections, and documentation concepts, not patient identifiers.
How current is the ICD-10 code set on HCC Buddy?
HCC Buddy ships the current FY2026 ICD-10-CM code set (effective October 1, 2025 through September 30, 2026), including the April 1, 2026 mid-year update. The CMS-HCC V28 model is at 100 percent phase-in for payment year 2026. Historical FY2016 through FY2025 code sets remain searchable for retrospective coding and audit work.