ICD-10-CM 2027
ICD-10 code for Megalocephalus
From the official ICD-10-CM alphabetic index entry “Megalocephalus, megalocephaly NEC”. Page updated September 29, 2026.
About coding Megalocephalus
The ICD-10-CM code for Megalocephalus is Q75.3 (Macrocephaly).
Within Q75 (other congenital malformations of skull and face bones), Q75.3 is specifically for Macrocephaly. Related codes cover craniosynostosis (Q75.0), craniofacial dysostosis (Q75.1), Hypertelorism (Q75.2), Mandibulofacial dysostosis (Q75.4), Oculomandibular dysostosis (Q75.5), other specified congenital malformations of skull and face bones (Q75.8) and congenital malformation of skull and face bones, unspecified (Q75.9).
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.
Common questions about Megalocephalus ICD-10 codes
What is the ICD-10 code for Megalocephalus?
- Q75.3 — Macrocephaly.
Is Q75.3 billable?
- Yes. Q75.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q75.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q75.3 as a principal diagnosis.
Is Q75.3 a CC or MCC?
- No. Q75.3 is neither a CC nor an MCC under MS-DRG v44.0.