M02.129
BillablePostdysenteric arthropathy, unspecified elbow
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M02.129 an HCC code?
Yes. M02.129 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 M02.129
For M02.129to 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 M02.129 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
M02.129 is the ICD-10-CM diagnosis code for postdysenteric arthropathy, unspecified elbow. Joint inflammation and pain in the elbow following a dysentery infection, when the specific side (left or right) is not documented. M02.129 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, M02.129 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, M02.129 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 only when laterality cannot be determined from documentation; attempt to clarify with provider. Because M02.129 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 M02.129 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
Clinical Significance
This diagnosis captures postdysenteric arthropathy affecting the elbow when laterality is not specified or documented, representing a reactive arthritis requiring chronic management. The unspecified nature indicates incomplete documentation while still recognizing the serious post-infectious joint complication.
Documentation Requirements
- ✓History of dysentery or infectious diarrheal illness
- ✓Elbow joint involvement documented without side specification
- ✓Evidence of arthropathy symptoms and signs
- ✓Post-infectious timing relationship established
- ✓Chronic or ongoing nature of joint condition
- ✓Physical findings consistent with arthritis
- ✓Exclusion of other joint pathologies
Commonly Confused Codes
- •M02.121 — Postdysenteric arthropathy, right elbow (use when right side documented)
- •M02.122 — Postdysenteric arthropathy, left elbow (use when left side documented)
- •M02.19 — Postdysenteric arthropathy, multiple sites (when multiple joints involved)
- •M00.029 — Staphylococcal arthritis, unspecified elbow (septic arthritis)
- •M25.529 — Pain in unspecified elbow (symptom, not diagnostic code)