M89.671
BillableOsteopathy after poliomyelitis, right ankle and foot
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M89.671 an HCC code?
Yes. M89.671 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 M89.671
For M89.671 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 M89.671 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
M89.671 is the ICD-10-CM diagnosis code for osteopathy after poliomyelitis, right ankle and foot. Bone disease that develops as a complication of poliomyelitis affecting the right ankle and foot, causing weakening or deformity of the bone in that area. M89.671 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, M89.671 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, M89.671 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.
Ensure documentation clearly indicates poliomyelitis as the underlying cause of the osteopathy. Because M89.671 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 M89.671 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Ensure documentation clearly indicates poliomyelitis as the underlying cause of the osteopathy
- •The fifth character '1' indicates right side; confirm laterality matches the clinical findings
Clinical Significance
Right ankle and foot osteopathy after poliomyelitis represents a chronic skeletal complication with potential for significant functional disability and mobility impairment. This diagnosis is important for risk adjustment as it indicates ongoing orthopedic complications requiring specialized care, potential orthotic support, and long-term monitoring.
Documentation Requirements
- ✓Clear documentation of history of poliomyelitis infection
- ✓Evidence of osteopathy specifically affecting right ankle and foot structures
- ✓Clinical symptoms of bone changes, deformities, or functional limitations in right foot/ankle
- ✓Imaging studies confirming bone abnormalities consistent with post-polio osteopathy
- ✓Provider assessment establishing connection between current condition and prior polio
- ✓Documentation of impact on weight-bearing, ambulation, and mobility
- ✓Evidence of need for orthotic support or specialized footwear
- ✓Assessment of disease progression and treatment requirements
Commonly Confused Codes
- •M89.672 — Osteopathy after poliomyelitis, left ankle and foot - incorrect laterality
- •M89.679 — Osteopathy after poliomyelitis, unspecified ankle and foot - when laterality is actually documented
- •G14 — Postpolio syndrome - neurological rather than bone manifestation
- •M21.371 — Foot drop, right foot - neurological condition rather than bone pathology
- •M20.11 — Hallux valgus (acquired), right foot - specific deformity rather than post-polio osteopathy