M88.0 Osteitis deformans of skull

Billable ICD-10-CM code, FY2026.

Applies from M88 Osteitis deformans [Paget's disease of bone]

Excludes1 (never code together)

• osteitis deformans in neoplastic disease (M90.6)

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 731.0 Osteitis deformans without mention of bone tumor (approximate)

Code annotations containing back-references to M88.0

Back-references to M88.0

• Type 2 Excludes: M88.88 Osteitis deformans of other bones ("osteitis deformans of skull (M88.0)")

Back-references to M88

• Type 1 Excludes: M43 Other deforming dorsopathies ("spinal curvature in Paget's disease of bone [osteitis deformans] (M88.-)")
• Type 1 Excludes: M90.6 Osteitis deformans in neoplastic diseases ("osteitis deformans [Paget's disease of bone] (M88.-)")

Diagnosis Index entries for M88.0

• Osteitis › deformans › skull
• Paget's disease › bone › skull

Nearby codes

• M88 Osteitis deformans [Paget's disease of bone]
• M88.0 Osteitis deformans of skull (this code)
• M88.1 Osteitis deformans of vertebrae
• M88.8 Osteitis deformans of other bones
• M88.81 Osteitis deformans of shoulder
• M88.811 Osteitis deformans of right shoulder
• M88.812 Osteitis deformans of left shoulder