M01.X32
BillableDirect infection of left wrist in infectious and parasitic diseases classified elsewhere
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M01.X32 an HCC code?
Yes. M01.X32 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 M01.X32
For M01.X32to 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 M01.X32 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
M01.X32 is the ICD-10-CM diagnosis code for direct infection of left wrist in infectious and parasitic diseases classified elsewhere. An infection in the left wrist joint caused by a disease classified elsewhere, such as tuberculosis or a parasitic infection. M01.X32 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering infectious arthropathies (m00-m02).
Under the CMS-HCC V28 risk adjustment model, M01.X32 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, M01.X32 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.
This code requires a secondary code to identify the underlying infectious or parasitic disease causing the joint infection. Because M01.X32 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 M01.X32 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code requires a secondary code to identify the underlying infectious or parasitic disease causing the joint infection
- •Use this code when documenting that the wrist infection is a direct manifestation of another classified infectious condition
Clinical Significance
Direct infection of the left wrist joint caused by infectious or parasitic diseases classified elsewhere represents a serious condition that can severely impact hand function and activities of daily living. The condition requires prompt treatment to prevent permanent joint damage and preserve functional capacity.
Documentation Requirements
- ✓Specific documentation of left wrist joint infection
- ✓Primary code for underlying infectious or parasitic disease
- ✓Clear evidence of direct causation rather than coincidental occurrence
- ✓Clinical findings of wrist joint inflammation, pain, and limited range of motion
- ✓Laboratory studies supporting infectious process and systemic inflammation
- ✓Radiological confirmation of joint involvement and any structural changes
- ✓Synovial fluid analysis results if joint aspiration was performed
- ✓Comprehensive treatment addressing both underlying disease and joint infection
Commonly Confused Codes
- •M00.932 — Pyogenic arthritis, left wrist (routine bacterial joint infection)
- •M25.532 — Pain in left wrist (joint symptoms without infectious cause)
- •M01.X31 — Direct infection of right wrist in infectious diseases classified elsewhere
- •M02.132 — Postdysenteric arthropathy, left wrist (reactive arthropathy following dysentery)