ICD-10-CM 2027
ICD-10 code for Synchondrosis abnormal
From the official ICD-10-CM alphabetic index entry “Abnormal, abnormality, abnormalities › synchondrosis”. Page updated September 29, 2026.
About coding Synchondrosis abnormal
The ICD-10-CM code for Synchondrosis abnormal is Q78.8 (Other specified osteochondrodysplasias).
Within Q78, choose Q78.8 (Other specified osteochondrodysplasias) only when documentation doesn't support a more specific option: Osteogenesis imperfecta (Q78.0), Polyostotic fibrous dysplasia (Q78.1), Osteopetrosis (Q78.2), progressive diaphyseal dysplasia (Q78.3), Enchondromatosis (Q78.4), Metaphyseal dysplasia (Q78.5), multiple congenital exostoses (Q78.6) and osteochondrodysplasia, unspecified (Q78.9).
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 Synchondrosis abnormal ICD-10 codes
What is the ICD-10 code for Synchondrosis abnormal?
- Q78.8 — Other specified osteochondrodysplasias.
Is Q78.8 billable?
- Yes. Q78.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q78.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q78.8 as a principal diagnosis.
Is Q78.8 a CC or MCC?
- No. Q78.8 is neither a CC nor an MCC under MS-DRG v44.0.