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ICD-10-CM 2027 diagnosis code

Q75.021Coronal craniosynostosis, unilateral

✓ Billable / specificPOA exempt

Q75.021 is a valid, billable ICD-10-CM code for coronal craniosynostosis, unilateral. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2026 (effective October 1, 2025). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q75.021

Q75.021 is the ICD-10-CM diagnosis code for Coronal craniosynostosis, unilateral. It belongs to category Q75 (other congenital malformations of skull and face bones), 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 Q75.02 (Coronal craniosynostosis), Q75.021 is specifically for Coronal craniosynostosis, unilateral. Related codes cover bilateral (Q75.022) and unspecified (Q75.029).

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 was added in FY2024, effective October 1, 2023, and changed in FY2026.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Non-deformational anterior plagiocephaly

Notes that apply from higher levels

Instructions written at a parent level also apply to Q75.021.

› From Q75.02 Coronal craniosynostosis
Excludes1
› From Q75 Other congenital malformations of skull and face bones
Excludes1
  • congenital malformation of face NOS (Q18.-)
  • congenital malformation syndromes classified to Q87.-
  • dentofacial anomalies [including malocclusion] (M26.-)
  • musculoskeletal deformities of head and face (Q67.0-Q67.4)
  • skull defects associated with congenital anomalies of brain such as:
  • anencephaly (Q00.0)
  • encephalocele (Q01.-)
  • hydrocephalus (Q03.-)
  • microcephaly (Q02)

Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to Q75.021.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2024 (effective 10/1/2023): Added
  • FY2026 (effective 10/1/2025): Title revised — was “Coronal craniosynostosis unilateral”

Common questions about Q75.021

Is Q75.021 billable?

Yes. Q75.021 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Q75.021 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Q75.021 as a principal diagnosis.

Is Q75.021 a CC or MCC?

No. Q75.021 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does Q75.021 group to?

Q75.021 is used in the MS-DRG v44.0 logic for MS-DRG 564 (Other Musculoskeletal System and Connective Tissue Diagnoses with MCC), MS-DRG 565 (Other Musculoskeletal System and Connective Tissue Diagnoses with CC) and MS-DRG 566 (Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.