ICD-10-CM 2027
ICD-10 code for bone paget's disease
From the official ICD-10-CM alphabetic index entry “Paget's disease › bone”. Page updated September 29, 2026.
About coding bone paget's disease
The ICD-10-CM code for bone paget's disease is M88.9 (Osteitis deformans of unspecified bone). The official index lists 23 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M88.9.
Within M88, choose M88.9 (unspecified bone) only when documentation doesn't support a more specific option: skull (M88.0), vertebrae (M88.1) and other bones (M88.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 553 (Bone Diseases and Arthropathies with MCC, relative weight 1.2494) and DRG 554 (Bone Diseases and Arthropathies without MCC, relative weight 0.8331), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific bone paget's disease codes (official index)
- carpus M88.84 — Osteitis deformans of hand
- clavicle M88.81 — Osteitis deformans of shoulder
- femur M88.85 — Osteitis deformans of thigh
- fibula M88.86 — Osteitis deformans of lower leg
- finger M88.84 — Osteitis deformans of hand
- humerus M88.82 — Osteitis deformans of upper arm
- ilium M88.88 — Osteitis deformans of other bones
- in neoplastic disease
- ischium M88.88 — Osteitis deformans of other bones
- metacarpus M88.84 — Osteitis deformans of hand
- metatarsus M88.87 — Osteitis deformans of ankle and foot
- multiple sites M88.89 — Osteitis deformans of multiple sites
- neck M88.88 — Osteitis deformans of other bones
- pubic ramus [pubis] M88.88 — Osteitis deformans of other bones
- radius M88.83 — Osteitis deformans of forearm
- rib M88.88 — Osteitis deformans of other bones
- scapula M88.81 — Osteitis deformans of shoulder
- skull M88.0 — Osteitis deformans of skull
- specified NEC M88.88 — Osteitis deformans of other bones
- tarsus M88.87 — Osteitis deformans of ankle and foot
- tibia M88.86 — Osteitis deformans of lower leg
- toe M88.87 — Osteitis deformans of ankle and foot
- ulna M88.83 — Osteitis deformans of forearm
- vertebra M88.1 — Osteitis deformans of vertebrae
Common questions about bone paget's disease ICD-10 codes
What is the ICD-10 code for bone paget's disease?
- M88.9 — Osteitis deformans of unspecified bone. More specific codes apply when the documentation supports them: M88.84, M88.81, M88.85, M88.86 and others below.
What is the ICD-10 code for carpus bone paget's disease?
- M88.84 — Osteitis deformans of hand (header code; choose a more specific subcode).
What is the ICD-10 code for clavicle bone paget's disease?
- M88.81 — Osteitis deformans of shoulder (header code; choose a more specific subcode).
What is the ICD-10 code for femur bone paget's disease?
- M88.85 — Osteitis deformans of thigh (header code; choose a more specific subcode).
What is the ICD-10 code for fibula bone paget's disease?
- M88.86 — Osteitis deformans of lower leg (header code; choose a more specific subcode).
What is the ICD-10 code for finger bone paget's disease?
- M88.84 — Osteitis deformans of hand (header code; choose a more specific subcode).
What is the ICD-10 code for humerus bone paget's disease?
- M88.82 — Osteitis deformans of upper arm (header code; choose a more specific subcode).
Is M88.9 billable?
- Yes. M88.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M88.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M88.9 as a principal diagnosis.
Is M88.9 a CC or MCC?
- No. M88.9 is neither a CC nor an MCC under MS-DRG v44.0.