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ICD-10-CM 2027 diagnosis code

Q66.52Congenital pes planus, left foot

✓ Billable / specificPOA exempt

Q66.52 is a valid, billable ICD-10-CM code for congenital pes planus, left foot. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q66.52

Q66.52 is the ICD-10-CM diagnosis code for congenital pes planus, left 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 Q66.5 (congenital pes planus), Q66.52 is specifically for congenital pes planus, left foot. Related codes cover unspecified foot (Q66.50) and right foot (Q66.51).

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), DRG 566 (Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC, relative weight 0.7378) and DRG 795 (Normal Newborn, relative weight 0.2022), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), 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 754.61 (congenital pes planus).

Notes that apply from higher levels

Instructions written at a parent level also apply to Q66.52.

› From Q66.5 Congenital pes planus
Excludes1
  • pes planus, acquired (M21.4)
› 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.

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

ICD-9-CM equivalent

Converter →
  • 754.61Congenital pes planusapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

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
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about Q66.52

Is Q66.52 billable?

Yes. Q66.52 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Q66.52 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Q66.52 as a principal diagnosis.

Is Q66.52 a CC or MCC?

No. Q66.52 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does Q66.52 group to?

Q66.52 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), MS-DRG 566 (Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC) and MS-DRG 795 (Normal Newborn). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for Q66.52?

The CMS General Equivalence Mappings map Q66.52 to ICD-9-CM 754.61.