Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis
Under the CMS-HCC V28 risk adjustment model (PY2026 Medicare Advantage), HCC 278 carries a community non-dual aged RAF of 0.818, and 4 payable ICD-10-CM diagnosis codes map to it. In the V28 hierarchy it is superseded by HCC 276, HCC 277 when a more severe category in the same disease group is also present.
Medically reviewed by Jess P., CPC · Reviewed: May 30, 2026
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.
Combine this factor with demographics and other HCCs in the RAF score calculator to model the full CMS-HCC V28 RAF for a member.
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)
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.
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 payment Hierarchical Condition Category in the CMS-HCC V28 risk adjustment model (100% phase-in for payment year 2026). 4 payable ICD-10-CM codes map to it.
What is the RAF weight for HCC 278?
The community non-dual aged relative factor for CMS-HCC V28 category 278 is 0.818. 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 278?
4 payable ICD-10-CM diagnosis codes map to 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HCC 278 is superseded by HCC 276 (Lung Transplant Status/Complications), HCC 277 (Cystic Fibrosis).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 published ICD-10-CM mapping file plus 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.