Q70.4Polysyndactyly, unspecified

Q70.4 is the ICD-10-CM diagnosis code for Polysyndactyly, unspecified. It belongs to category Q70 (syndactyly), block Q65-Q79 (congenital malformations and deformations of the musculoskeletal system) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Q70, choose Q70.4 (Polysyndactyly, unspecified) only when documentation doesn't support a more specific option: fused fingers (Q70.0), Webbed fingers (Q70.1), fused toes (Q70.2), Webbed toes (Q70.3) and unspecified (Q70.9).

Don't report Q70.4 together with the conditions in its Excludes1 note: specified syndactyly of hand and feet - code to specified conditions (Q70.0--Q70.3-).

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.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 755.00 (Polydactyly, unspecified digits) and 755.10 (syndactyly of multiple and unspecified sites).