ICD-10-CM 2027
ICD-10 code for cranial bones diastasis
From the official ICD-10-CM alphabetic index entry “Diastasis › cranial bones”. Page updated September 29, 2026.
About coding cranial bones diastasis
The ICD-10-CM code for cranial bones diastasis is M84.88 (Other disorders of continuity of bone, other site). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on M84.88.
Within M84.8, choose M84.88 (other site) only when documentation doesn't support a more specific option: unspecified site (M84.80), shoulder (M84.81), humerus (M84.82), ulna and radius (M84.83), hand (M84.84), pelvic region and thigh (M84.85), tibia and fibula (M84.86) and ankle and foot (M84.87).
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 564 (Other Musculoskeletal System and Connective Tissue Diagnoses with MCC, relative weight 1.4908), DRG 565 (Other Musculoskeletal System and Connective Tissue Diagnoses with CC, relative weight 0.9783) and DRG 566 (Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC, relative weight 0.7378), 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 cranial bones diastasis codes (official index)
- congenital NEC Q75.8 — Other specified congenital malformations of skull and face bones
Common questions about cranial bones diastasis ICD-10 codes
What is the ICD-10 code for cranial bones diastasis?
- M84.88 — Other disorders of continuity of bone, other site. More specific codes apply when the documentation supports them: Q75.8.
What is the ICD-10 code for congenital nec cranial bones diastasis?
- Q75.8 — Other specified congenital malformations of skull and face bones.
Is M84.88 billable?
- Yes. M84.88 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M84.88 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M84.88 as a principal diagnosis.
Is M84.88 a CC or MCC?
- No. M84.88 is neither a CC nor an MCC under MS-DRG v44.0.