G71.29
BillableOther congenital myopathy
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is G71.29 an HCC code?
Yes. G71.29 maps to Muscular Dystrophy under the CMS-HCC V28 risk adjustment model (and Muscular Dystrophy 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 G71.29
For G71.29to 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 G71.29 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
G71.29 is the ICD-10-CM diagnosis code for other congenital myopathy. A muscle weakness condition present from birth that does not fit into other defined congenital myopathy categories. G71.29 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering diseases of myoneural junction and muscle (g70-g73).
Under the CMS-HCC V28 risk adjustment model, G71.29 maps to Muscular Dystrophy (HCC 197) with a community, non-dual, aged base RAF weight of 0.000. Under the older V24 model, G71.29 mapped to the same category but with a base RAF weight of 0.358 — 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 after excluding nemaline myopathy, centronuclear myopathy, and other specifically classified congenital myopathies. Because G71.29 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 G71.29 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only after excluding nemaline myopathy, centronuclear myopathy, and other specifically classified congenital myopathies
- •Document clinical features, muscle biopsy findings, and genetic testing to support the diagnosis
Clinical Significance
Other congenital myopathy serves as a residual code for congenital muscle diseases that do not fit into classified categories, such as core myopathies (central core disease, multiminicore disease) or other rare structural myopathies. These conditions cause lifelong disability requiring ongoing neuromuscular care. Accurate coding ensures risk adjustment reflects the chronic disease burden of these patients.
Documentation Requirements
- ✓Clinical evidence of congenital myopathy: early onset weakness, hypotonia
- ✓Muscle biopsy findings identifying a specific structural abnormality when available
- ✓Genetic testing results (positive, pending, or negative for known mutations)
- ✓Documentation that the myopathy does not fit nemaline, centronuclear, or other specifically coded types
- ✓Functional status and respiratory function assessment
- ✓Provider's explicit diagnosis of congenital myopathy with specification of the type if known
Commonly Confused Codes
- •G71.21 — Nemaline myopathy should be used when nemaline rods are identified
- •G71.220 — X-linked myotubular myopathy should be used for confirmed MTM1 mutations
- •G71.228 — Other centronuclear myopathy should be used when central nuclei are the predominant finding
- •G71.20 — Congenital myopathy, unspecified is for truly unknown types; G71.29 is for identified types without specific codes