V28 HCC 454
Stem Cell, Including Bone Marrow, Transplant Status/Complications
Under the CMS-HCC V28 risk adjustment model (PY2026 Medicare Advantage), HCC 454 has a source-labeled community non-dual aged reference coefficient of 1.068, and 14 ICD-10-CM diagnosis codes appear in its official mapping.
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.
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.
ICD-10-CM codes that map to HCC 454 (14)
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.
- D89.810Acute graft-versus-host disease
- D89.811Chronic graft-versus-host disease
- D89.812Acute on chronic graft-versus-host disease
- D89.813Graft-versus-host disease, unspecified
- M31.11Hematopoietic stem cell transplantation-associated thrombotic microangiopathy [HSCT-TMA]
- T86.00Unspecified complication of bone marrow transplant
- T86.01Bone marrow transplant rejection
- T86.02Bone marrow transplant failure
- T86.03Bone marrow transplant infection
- T86.09Other complications of bone marrow transplant
- T86.5Complications of stem cell transplant
- Z48.290Encounter for aftercare following bone marrow transplant
- Z94.81Bone marrow transplant status
- Z94.84Stem cells transplant status
Coder workflow notes
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Frequently asked questions
What is CMS-HCC V28 category 454?
HCC 454 is "Stem Cell, Including Bone Marrow, Transplant Status/Complications", a Hierarchical Condition Category in the CMS-HCC V28 risk adjustment model (100% phase-in for payment year 2026). 14 ICD-10-CM codes appear in its official mapping.
What reference coefficient is published for HCC 454?
The source-labeled community non-dual aged reference coefficient for CMS-HCC V28 category 454 is 1.068. 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 454?
14 ICD-10-CM diagnosis codes appear in the official mapping for CMS-HCC V28 category 454 (Stem Cell, Including Bone Marrow, Transplant Status/Complications) for payment year 2026.
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.