M00.88
BillableArthritis due to other bacteria, vertebrae
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M00.88 an HCC code?
Yes. M00.88 maps to Bone/Joint/Muscle/Severe Soft Tissue 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 M00.88
For M00.88to 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 M00.88 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
M00.88 is the ICD-10-CM diagnosis code for arthritis due to other bacteria, vertebrae. Bacterial infection causing inflammation and swelling in the vertebrae (spine bones), caused by bacteria other than the most common types. M00.88 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, M00.88 maps to Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis (HCC 92) with a community, non-dual, aged base RAF weight of 0.479. Under the older CMS-HCC V24 model, M00.88 maps to Bone/Joint/Muscle Infections/Necrosis (HCC 39) with a community, non-dual, aged base RAF weight of 0.401. 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 does not require laterality specification as vertebrae are midline structures. Because M00.88 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 M00.88 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code does not require laterality specification as vertebrae are midline structures
- •Verify the bacterial organism is documented; if not specified, consider if a more general code applies
Clinical Significance
Bacterial arthritis of the vertebrae (spondylitis) represents one of the most serious forms of infectious arthropathy due to proximity to the spinal cord and risk of neurological complications. This condition requires immediate treatment to prevent spinal instability, abscess formation, and permanent neurological damage.
Documentation Requirements
- ✓Confirmation of 'other bacteria' as causative organism
- ✓Documentation of vertebral joint involvement
- ✓Microbiological evidence of bacterial infection
- ✓Clinical signs of spinal infection
- ✓Evidence of systemic antibiotic therapy
- ✓Neurological assessment and monitoring
- ✓Imaging studies showing vertebral involvement
- ✓Exclusion of discitis or osteomyelitis versus arthritis
Commonly Confused Codes
- •M00.08 — Staphylococcal arthritis of vertebrae (specific organism)
- •M46.20 — Osteomyelitis of vertebra, unspecified (bone infection)
- •M46.30 — Infection of intervertebral disc, unspecified (disc infection)
- •M06.88 — Other specified rheumatoid arthritis of vertebrae (autoimmune)
- •M48.8 — Other specified spondylopathies (mechanical)