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ICD-10-CM 2027 diagnosis code

Q66.211Congenital metatarsus primus varus, right foot

✓ Billable / specificPOA exempt

Q66.211 is a valid, billable ICD-10-CM code for congenital metatarsus primus varus, right foot. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2020 (effective October 1, 2019). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q66.211

Q66.211 is the ICD-10-CM diagnosis code for congenital metatarsus primus varus, right foot. It belongs to category Q66 (congenital deformities of feet), 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 Q66.21 (congenital metatarsus primus varus), Q66.211 is specifically for congenital metatarsus primus varus, right foot. Related codes cover left foot (Q66.212) and unspecified foot (Q66.219).

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 FY2020, effective October 1, 2019.

Notes that apply from higher levels

Instructions written at a parent level also apply to Q66.211.

› From Q66 Congenital deformities of feet
Excludes1
  • reduction defects of feet (Q72.-)
  • valgus deformities (acquired) (M21.0-)
  • varus deformities (acquired) (M21.1-)

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

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
  • FY2020 (effective 10/1/2019): Added
  • No changes since FY2020.

Common questions about Q66.211

Is Q66.211 billable?

Yes. Q66.211 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Q66.211 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Q66.211 as a principal diagnosis.

Is Q66.211 a CC or MCC?

No. Q66.211 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does Q66.211 group to?

Q66.211 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.