M89.679
BillableOsteopathy after poliomyelitis, unspecified ankle and foot
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M89.679 an HCC code?
Yes. M89.679 maps to Bone/Joint/Muscle Infections/Necrosis under the CMS-HCC V28 risk adjustment model (and Bone/Joint/Muscle Infections/Necrosis 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 M89.679
For M89.679 to 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 M89.679 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
M89.679 is the ICD-10-CM diagnosis code for osteopathy after poliomyelitis, unspecified ankle and foot. Bone disease that develops as a complication of poliomyelitis affecting the ankle and foot, but the specific side (left or right) is not documented or specified. M89.679 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other osteopathies (m86-m90).
Under the CMS-HCC V28 risk adjustment model, M89.679 maps to Bone/Joint/Muscle Infections/Necrosis (HCC 92) with a community, non-dual, aged base RAF weight of 0.209. Under the older V24 model, M89.679 mapped to the same category but with a base RAF weight of 0.482 — V28 recalibrated weights across the entire model. 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.
Use this code only when laterality cannot be determined from available documentation. Because M89.679 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 M89.679 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when laterality cannot be determined from available documentation
- •Query the provider to obtain specific laterality information for more accurate coding when possible
Clinical Significance
Post-polio osteopathy affecting ankle and foot without laterality specification represents a chronic bone complication requiring ongoing medical management. This diagnosis captures the long-term skeletal consequences of poliomyelitis and maps to high-value HCC categories.
Documentation Requirements
- ✓Clear history of poliomyelitis documented in medical record
- ✓Evidence of bone pathology in ankle/foot region
- ✓Clinical examination findings supporting osteopathy
- ✓Relationship between current condition and prior polio established
- ✓Functional assessment of affected extremity
- ✓Diagnostic imaging confirming bone changes
- ✓Treatment plan addressing bone/joint complications
Commonly Confused Codes
- •M89.672 — Osteopathy after poliomyelitis, left ankle and foot (specifies laterality)
- •M89.671 — Osteopathy after poliomyelitis, right ankle and foot (specifies laterality)
- •G14 — Postpolio syndrome (neurological rather than skeletal focus)
- •M25.579 — Pain in unspecified ankle and foot (symptom, not polio-related)