M49.88
BillableSpondylopathy in diseases classified elsewhere, sacral and sacrococcygeal region
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M49.88 an HCC code?
Yes. M49.88 maps to Rheumatoid Arthritis and Inflammatory Connective Tissue Disease under the V24 model but is not retained in V28.
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 M49.88
For M49.88to 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 M49.88 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
M49.88 is the ICD-10-CM diagnosis code for spondylopathy in diseases classified elsewhere, sacral and sacrococcygeal region. Spine disease in the sacral and tailbone area caused by another medical condition classified elsewhere. M49.88 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering spondylopathies (m45-m49).
Under the older CMS-HCC V24 model, M49.88 maps to Rheumatoid Arthritis and Inflammatory Connective Tissue Disease (HCC 40) with a community, non-dual, aged base RAF weight of 0.421. 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.
Code the primary disease first, then use this code for the spinal manifestation. Because M49.88 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 M49.88 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Code the primary disease first, then use this code for the spinal manifestation
- •Sacrococcygeal region includes the sacrum and coccyx
Clinical Significance
This affects the sacral and tailbone region secondary to another classified disease, impacting pelvic stability, sitting tolerance, and bowel/bladder function potentially. Sacral involvement indicates advanced systemic disease with complex management needs including neurological monitoring.
Documentation Requirements
- ✓Specific documentation of sacral and sacrococcygeal involvement
- ✓Clear identification of underlying disease causing spondylopathy
- ✓Imaging evidence of sacral/coccygeal structural changes
- ✓Clinical findings supporting sacral region pathology
- ✓Documentation of secondary nature 'in diseases classified elsewhere'
- ✓Assessment of pelvic floor function if applicable
- ✓Neurological evaluation for sacral nerve involvement