Relative factors by segment
Each segment is a separate regression; the factor is added to the beneficiary's demographic factors and other categories, then normalized and reduced by the coding intensity adjustment before it meets the plan's base rate. A factor of 1.000 equals the expected cost of an average beneficiary.
| Segment | Model code | Relative factor |
|---|---|---|
| Community, non-dual, aged | CNA_HCC280 | 0.319 |
| Community, non-dual, disabled | CND_HCC280 | 0.209 |
| Community, full-benefit dual, aged | CFA_HCC280 | 0.390 |
| Community, full-benefit dual, disabled | CFD_HCC280 | 0.281 |
| Community, partial-benefit dual, aged | CPA_HCC280 | 0.321 |
| Community, partial-benefit dual, disabled | CPD_HCC280 | 0.234 |
| Long-term institutional | INS_HCC280 | 0.312 |
Hierarchy
Hierarchical condition categories pay only the most severe manifestation of a disease. When HCC 276 (Lung Transplant Status/Complications) or HCC 277 (Cystic Fibrosis) or HCC 278 (Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis) or HCC 279 (Severe Persistent Asthma) is also documented for the same beneficiary, HCC 280 is dropped from the score.
ICD-10-CM codes that map to HCC 280
79 codes map to this category in the PY2027 initial mapping, concentrated in the J84 (17), J67 (10), J63 (7), J68 (7), J43 (5), J44 (5) code families. Descriptions are the CMS mapping descriptions for the FY2026 code set; a code that is deleted or split in the October code update stays valid for dates of service before the change.
| ICD-10-CM | Description |
|---|---|
| B4481 | Allergic bronchopulmonary aspergillosis |
| J410 | Simple chronic bronchitis |
| J411 | Mucopurulent chronic bronchitis |
| J418 | Mixed simple and mucopurulent chronic bronchitis |
| J42 | Unspecified chronic bronchitis |
| J430 | Unilateral pulmonary emphysema [MacLeod's syndrome] |
| J431 | Panlobular emphysema |
| J432 | Centrilobular emphysema |
| J438 | Other emphysema |
| J439 | Emphysema, unspecified |
| J440 | Chronic obstructive pulmonary disease with (acute) lower respiratory infection |
| J441 | Chronic obstructive pulmonary disease with (acute) exacerbation |
| J4481 | Bronchiolitis obliterans and bronchiolitis obliterans syndrome |
| J4489 | Other specified chronic obstructive pulmonary disease |
| J449 | Chronic obstructive pulmonary disease, unspecified |
| J470 | Bronchiectasis with acute lower respiratory infection |
| J471 | Bronchiectasis with (acute) exacerbation |
| J479 | Bronchiectasis, uncomplicated |
| J60 | Coalworker's pneumoconiosis |
| J61 | Pneumoconiosis due to asbestos and other mineral fibers |
| J620 | Pneumoconiosis due to talc dust |
| J628 | Pneumoconiosis due to other dust containing silica |
| J630 | Aluminosis (of lung) |
| J631 | Bauxite fibrosis (of lung) |
| J632 | Berylliosis |
| J633 | Graphite fibrosis (of lung) |
| J634 | Siderosis |
| J635 | Stannosis |
| J636 | Pneumoconiosis due to other specified inorganic dusts |
| J64 | Unspecified pneumoconiosis |
| J65 | Pneumoconiosis associated with tuberculosis |
| J660 | Byssinosis |
| J661 | Flax-dressers' disease |
| J662 | Cannabinosis |
| J668 | Airway disease due to other specific organic dusts |
| J670 | Farmer's lung |
| J671 | Bagassosis |
| J672 | Bird fancier's lung |
| J673 | Suberosis |
| J674 | Maltworker's lung |
| J675 | Mushroom-worker's lung |
| J676 | Maple-bark-stripper's lung |
| J677 | Air conditioner and humidifier lung |
| J678 | Hypersensitivity pneumonitis due to other organic dusts |
| J679 | Hypersensitivity pneumonitis due to unspecified organic dust |
| J680 | Bronchitis and pneumonitis due to chemicals, gases, fumes and vapors |
| J681 | Pulmonary edema due to chemicals, gases, fumes and vapors |
| J682 | Upper respiratory inflammation due to chemicals, gases, fumes and vapors, not elsewhere classified |
| J683 | Other acute and subacute respiratory conditions due to chemicals, gases, fumes and vapors |
| J684 | Chronic respiratory conditions due to chemicals, gases, fumes and vapors |
| J688 | Other respiratory conditions due to chemicals, gases, fumes and vapors |
| J689 | Unspecified respiratory condition due to chemicals, gases, fumes and vapors |
| J8281 | Chronic eosinophilic pneumonia |
| J8401 | Alveolar proteinosis |
| J8402 | Pulmonary alveolar microlithiasis |
| J8403 | Idiopathic pulmonary hemosiderosis |
| J8409 | Other alveolar and parieto-alveolar conditions |
| J8410 | Pulmonary fibrosis, unspecified |
| J84111 | Idiopathic interstitial pneumonia, not otherwise specified |
| J84113 | Idiopathic non-specific interstitial pneumonitis |
| J84114 | Acute interstitial pneumonitis |
| J84115 | Respiratory bronchiolitis interstitial lung disease |
| J84116 | Cryptogenic organizing pneumonia |
| J84117 | Desquamative interstitial pneumonia |
| J84178 | Other interstitial pulmonary diseases with fibrosis in diseases classified elsewhere |
| J842 | Lymphoid interstitial pneumonia |
| J8481 | Lymphangioleiomyomatosis |
| J8482 | Adult pulmonary Langerhans cell histiocytosis |
| J8489 | Other specified interstitial pulmonary diseases |
| J849 | Interstitial pulmonary disease, unspecified |
| J982 | Interstitial emphysema |
| J983 | Compensatory emphysema |
| J99 | Respiratory disorders in diseases classified elsewhere |
| M3213 | Lung involvement in systemic lupus erythematosus |
| M3301 | Juvenile dermatomyositis with respiratory involvement |
| M3311 | Other dermatomyositis with respiratory involvement |
| M3321 | Polymyositis with respiratory involvement |
| M3391 | Dermatopolymyositis, unspecified with respiratory involvement |
| M3502 | Sjogren syndrome with lung involvement |
Where these codes sat in the V22 model
The V28 recalibration renumbered and regrouped categories; this table shows which legacy V22 categories the same ICD-10 codes belonged to, which is the quickest way to reconcile a V22-era HCC gap list with the current model.
| V22 HCC | Codes |
|---|---|
| 112 | 61 |
| 111 | 17 |
| 40 | 1 |
Capturing and defending the category
A category counts for a payment year when a mapped diagnosis is documented at least once during the data collection year by an acceptable provider type at a face-to-face or audio-video encounter, and when the note shows the condition was monitored, evaluated, assessed or treated. Chronic conditions do not carry forward: a category that is not re-documented in the year drops out of the score, which is why annual wellness visits and problem-list reconciliation are where most recapture happens. Risk adjustment data validation audits sample enrollees and ask for the medical record behind each submitted category; an unsupported category is removed and, under the extrapolation rules, the error rate is applied across the contract. The QuickIntell risk adjustment product surfaces suspected and unsupported categories from the chart, and the HCC hub lists every V28 category with its factor and code count.
Frequently asked questions
Which ICD-10 codes map to HCC 280?
79 ICD-10-CM codes map to HCC 280 in the CMS PY2027 initial mapping, for example B4481 Allergic bronchopulmonary aspergillosis; J410 Simple chronic bronchitis; J411 Mucopurulent chronic bronchitis; J418 Mixed simple and mucopurulent chronic bronchitis. The full list is on this page; a code counts only when it is documented at a face-to-face or video encounter in the data collection year and supported by the record.
How much does HCC 280 add to a risk score?
The V28 relative factor for HCC 280 is 0.319 for a community, non-dual, aged beneficiary, 0.390 for full-benefit dual aged, 0.209 for non-dual disabled and 0.312 for long-term institutional members. A factor of 1.000 equals the expected annual cost of an average beneficiary, so the category's share of the payment follows the plan's base rate for that segment.
Does HCC 280 count together with related categories?
No. Within a hierarchy only the most severe category is paid. HCC 280 is dropped when HCC 276 (Lung Transplant Status/Complications) or HCC 277 (Cystic Fibrosis) or HCC 278 (Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis) or HCC 279 (Severe Persistent Asthma) is also present.
What has to be documented for HCC 280 to be valid?
The diagnosis must be recorded by an acceptable provider type during a face-to-face or audio-video encounter in the service year, with the note showing that the condition was monitored, evaluated, assessed or treated. Risk adjustment data validation audits recover payment for categories the record does not support, so the code on the claim and the assessment in the note must match.
Sources
Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-02. Verify against the primary file before billing or contracting decisions.
- ICD-10-CM to CMS-HCC V28 mappings, payment year 2027 initialVersion PY2027 initial ICD-10-CM mappings (dates of service 2026) · effective 2027-01-01 · file 2027 Initial ICD-10-CM Mappings.csvSHA-256 9c260b06d0dd2806…
- CMS-HCC V28 model software: labels, hierarchies and relative factorsVersion CMS-HCC V28 software V2826.115.T2 (PY2027 initial) · effective 2027-01-01 · file C2824T2N.csvSHA-256 20f38d537493b41c…
Disclaimer
Relative factors and mappings are reproduced from the CMS risk adjustment model files as an operational reference. Payment depends on the plan's base rate, normalization, the coding intensity adjustment and the enrollee's segment. Not legal, clinical or billing advice.