M85.671 ICD-10-CM Code: Other cyst of bone, right ankle and foot
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 553 — BONE DISEASES AND ARTHROPATHIES WITH MCC (MDC 08)
- MS-DRG 554 — BONE DISEASES AND ARTHROPATHIES WITHOUT MCC (MDC 08)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Other cyst of bone, right ankle and foot is a billable ICD-10-CM diagnosis code (M85.671).
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for M85.671 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- cyst of jaw NEC (M27.4)
- osteitis fibrosa cystica generalisata von Recklinghausen's disease of bone
- osteogenesis imperfecta (Q78.0)
- osteopetrosis (Q78.2)
- osteopoikilosis (Q78.8)
- polyostotic fibrous dysplasia (Q78.1)
Nearest Codes in This Family
Official ICD-10-CM classifications closest to M85.671 in its code family, with their registry titles.
- M85.66 — Other cyst of bone, lower leg
- M85.661 — Other cyst of bone, right lower leg
- M85.662 — Other cyst of bone, left lower leg
- M85.669 — Other cyst of bone, unspecified lower leg
- M85.67 — Other cyst of bone, ankle and foot
- M85.672 — Other cyst of bone, left ankle and foot
- M85.679 — Other cyst of bone, unspecified ankle and foot
- M85.68 — Other cyst of bone, other site
- M85.69 — Other cyst of bone, multiple sites
- M85.8 — Other specified disorders of bone density and structure