J64
BillableUnspecified pneumoconiosis
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is J64 an HCC code?
Yes. J64 maps to Chronic Obstructive Pulmonary Disease under the CMS-HCC V28 risk adjustment model (and Fibrosis of Lung and Other Chronic Lung Disorders under V24).
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for J64
For J64to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically — it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed J64 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
J64 is the ICD-10-CM diagnosis code for unspecified pneumoconiosis. This code describes lung disease caused by inhaling dust or particles over time, when the specific type of dust or particle cannot be identified. It's commonly seen in workers exposed to occupational dust without a clear diagnosis of a specific pneumoconiosis type. J64 sits in the ICD-10-CM chapter for diseases of the respiratory system (j00-j99), within the section covering lung diseases due to external agents (j60-j70).
Under the CMS-HCC V28 risk adjustment model, J64 maps to Chronic Obstructive Pulmonary Disease (HCC 280) with a community, non-dual, aged base RAF weight of 0.334. Under the older CMS-HCC V24 model, J64 maps to Fibrosis of Lung and Other Chronic Lung Disorders (HCC 112) with a community, non-dual, aged base RAF weight of 0.268. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
Always attempt to identify the specific type of pneumoconiosis (such as silicosis, asbestosis, or coal worker's pneumoconiosis) before using this unspecified code, as more specific codes provide better clinical detail. Because J64 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for J64 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Always attempt to identify the specific type of pneumoconiosis (such as silicosis, asbestosis, or coal worker's pneumoconiosis) before using this unspecified code, as more specific codes provide better clinical detail
- •Document the patient's occupational history and exposure to dust or particles to support the diagnosis and help determine if a more specific pneumoconiosis code should be used
Clinical Significance
Unspecified pneumoconiosis represents dust-induced lung disease where the specific causative agent cannot be determined. While it carries the same HCC weight as specified pneumoconioses, it signals incomplete documentation and should prompt provider queries to identify the specific dust type for both clinical management and accurate risk adjustment.
Documentation Requirements
- ✓Documentation that pneumoconiosis has been diagnosed (clinical, radiographic, or pathological evidence)
- ✓Occupational and environmental exposure history, even if the specific dust cannot be identified
- ✓Chest imaging findings showing pneumoconiotic changes
- ✓Pulmonary function test results
- ✓Provider attestation that the specific dust type could not be determined
- ✓Current respiratory symptoms and management plan
Commonly Confused Codes
- •J60 (Coal workers' pneumoconiosis) — use when coal mine exposure is documented
- •J61 (Pneumoconiosis due to asbestos and other mineral fibers) — use when asbestos exposure is confirmed
- •J62.8 (Pneumoconiosis due to other dust containing silica) — use when silica-containing dust is identified
- •J63.0-J63.6 — use when any specific inorganic dust is identified
- •J84.10 (Pulmonary fibrosis, unspecified) — use when fibrosis exists but no dust exposure is documented