Cystic Fibrosis
Under the CMS-HCC V28 risk adjustment model (PY2026 Medicare Advantage), HCC 277 carries a community non-dual aged RAF of 0.998, and 5 payable ICD-10-CM diagnosis codes map to it. In the V28 hierarchy it is superseded by HCC 276 when a more severe category in the same disease group is also present.
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.
V28 hierarchy
Trumped by: HCC 276 (a more severe category in the same disease group supersedes this one).
Supersedes: HCC 278, HCC 279, HCC 280 (this category is counted instead of these when they co-occur).
ICD-10-CM codes that map to HCC 277 (5)
Payable diagnosis codes that map to this category under CMS-HCC V28 PY2026. Open any code for its full description, HCC mapping, and coding guidance.
Frequently asked questions
What is CMS-HCC V28 category 277?
HCC 277 is "Cystic Fibrosis", a payment Hierarchical Condition Category in the CMS-HCC V28 risk adjustment model (100% phase-in for payment year 2026). 5 payable ICD-10-CM codes map to it.
What is the RAF weight for HCC 277?
The community non-dual aged relative factor for CMS-HCC V28 category 277 is 0.998. The exact factor varies by enrollment segment (community Medicaid and originally-disabled status, and institutional); the full segment table is published in the CMS V28 Rate Announcement.
How many ICD-10-CM codes map to HCC 277?
5 payable ICD-10-CM diagnosis codes map to CMS-HCC V28 category 277 (Cystic Fibrosis) for payment year 2026.
Which categories trump HCC 277 in the V28 hierarchy?
HCC 277 is superseded by HCC 276 (Lung Transplant Status/Complications). When a more severe category in the same disease group is documented, it is counted instead of HCC 277.
Source: CMS published ICD-10-CM mapping file plus CMS-HCC v28 PY2026 model software.