V28 HCC 278
Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis
Under the CMS-HCC V28 risk adjustment model (PY2026 Medicare Advantage), HCC 278 has a source-labeled community non-dual aged reference coefficient of 0.818, and 4 ICD-10-CM diagnosis codes appear in its official mapping. In the V28 hierarchy it is superseded by HCC 276, HCC 277 when a more severe category in the same disease group is also present.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.
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 276, HCC 277 (a more severe category in the same disease group supersedes this one).
Supersedes: HCC 279, HCC 280 (this category is counted instead of these when they co-occur).
ICD-10-CM codes that map to HCC 278 (4)
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 278?
HCC 278 is "Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis", a Hierarchical Condition Category in the CMS-HCC V28 risk adjustment model (100% phase-in for payment year 2026). 4 ICD-10-CM codes appear in its official mapping.
What reference coefficient is published for HCC 278?
The source-labeled community non-dual aged reference coefficient for CMS-HCC V28 category 278 is 0.818. 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 278?
4 ICD-10-CM diagnosis codes appear in the official mapping for CMS-HCC V28 category 278 (Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis) for payment year 2026.
Which categories trump HCC 278 in the V28 hierarchy?
HCC 278 is superseded by HCC 276 (Lung Transplant Status/Complications), HCC 277 (Cystic Fibrosis). When a more severe category in the same disease group is documented, it is counted instead of HCC 278.
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.