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V28 HCC 21

Lymphoma and Other Cancers

Under the CMS-HCC V28 risk adjustment model (PY2026 Medicare Advantage), HCC 21 has a source-labeled community non-dual aged reference coefficient of 0.671, and 463 ICD-10-CM diagnosis codes appear in its official mapping. In the V28 hierarchy it is superseded by HCC 17, HCC 18, HCC 19, HCC 20 when a more severe category in the same disease group is also present.

By the HCC Buddy Coding Team · Reviewed: May 30, 2026
V28 HCC 21Community non-dual aged reference coefficient 0.671
See ICD-10-CM codes for HCC 21Open the RAF Calculator

RAF factors

The community factor varies by Medicaid and originally-disabled status; the institutional factor applies to long-term-institutional members. These are the CMS-HCC V28 PY2026 relative factors.

Community NA: 0.671Community PBA: 0.627Community FBA: 0.654Community ND: 0.54Community PBD: 0.618Community FBD: 0.739Institutional: 0.493

These are source-labeled code-level HCC coefficient references, not a full member score. Use the RAF Calculator with complete member context for CMS-HCC V28 PY2026. No score is shown unless every required source and calculation check passes.

V28 hierarchy

Trumped by: HCC 17, HCC 18, HCC 19, HCC 20 (a more severe category in the same disease group supersedes this one).

Supersedes: HCC 22, HCC 23 (this category is counted instead of these when they co-occur).

ICD-10-CM codes that map to HCC 21 (463)

ICD-10-CM codes in the official mapping for this category under CMS-HCC V28 PY2026. Open any code for its full description and coding guidance.

Coder workflow notes

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Frequently asked questions

What is CMS-HCC V28 category 21?

HCC 21 is "Lymphoma and Other Cancers", a Hierarchical Condition Category in the CMS-HCC V28 risk adjustment model (100% phase-in for payment year 2026). 463 ICD-10-CM codes appear in its official mapping.

What reference coefficient is published for HCC 21?

The source-labeled community non-dual aged reference coefficient for CMS-HCC V28 category 21 is 0.671. The exact coefficient varies by enrollment segment (community Medicaid and originally-disabled status, and institutional); the full segment table is published in the CMS V28 model files.

How many ICD-10-CM codes map to HCC 21?

463 ICD-10-CM diagnosis codes appear in the official mapping for CMS-HCC V28 category 21 (Lymphoma and Other Cancers) for payment year 2026.

Which categories trump HCC 21 in the V28 hierarchy?

HCC 21 is superseded by HCC 17 (Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic), HCC 18 (Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid), HCC 19 (Myelodysplastic Syndromes, Multiple Myeloma, and Other Cancers), HCC 20 (Lung and Other Severe Cancers). When a more severe category in the same disease group is documented, it is counted instead of HCC 21.

Related references

Sources

CMS ICD-10-CM order-file billability plus the published mapping and CMS-HCC V28 PY2026 model software. CMS-HCC V28 model published at CMS.gov Risk Adjustors; ICD-10-CM member codes from the CMS ICD-10-CM code set.

Verified current to CMS-HCC V28, payment year 2026 — last reviewed May 30, 2026.