ICD-10-CM 2027 diagnosis code
Q74.1Congenital malformation of knee
Q74.1 is a valid, billable ICD-10-CM code for congenital malformation of knee. 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 Q74.1
Q74.1 is the ICD-10-CM diagnosis code for congenital malformation of knee. It belongs to category Q74 (other congenital malformations of limb(s)), 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 Q74 (other congenital malformations of limb(s)), Q74.1 is specifically for congenital malformation of knee. Related codes cover other congenital malformations of upper limb(s), including shoulder girdle (Q74.0), other congenital malformations of lower limb(s), including pelvic girdle (Q74.2), Arthrogryposis multiplex congenita (Q74.3), other specified congenital malformations of limb(s) (Q74.8) and unspecified congenital malformation of limb(s) (Q74.9).
Don't report Q74.1 together with the conditions in its Excludes1 note: congenital dislocation of knee (Q68.2), congenital genu recurvatum (Q68.2) and nail patella syndrome (Q87.2).
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 755.64 (congenital deformity of knee (joint)).
Coding notes
- Congenital absence of patella
- Congenital dislocation of patella
- Congenital genu valgum
- Congenital genu varum
- Rudimentary patella
Notes that apply from higher levels
Instructions written at a parent level also apply to Q74.1.
Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.
Alphabetic index entries
18 entriesTerms in the official ICD-10-CM index that lead to Q74.1.
- Absence (of) (organ or part) (complete or partial) › patella, congenital
- Agenesis › patella
- Anomaly, anomalous (congenital) (unspecified type) › knee
- Anomaly, anomalous (congenital) (unspecified type) › patella
- Bifid (congenital) › patella
- Biparta, bipartite › patella
- Dislocation (articular) › patella › congenital
- Elongated, elongation (congenital) › ligamentum patellae
- Genu › congenital
- Genu › extrorsum (acquired) › congenital
- Genu › introrsum (acquired) › congenital
- Genu › valgum (acquired) (knock-knee) › congenital
- Genu › varum (acquired) (bowleg) › congenital
- Hypertrophy, hypertrophic › meniscus, knee, congenital
- Hypoplasia, hypoplastic › patella
- Knock knee (acquired) › congenital
- Malposition › congenital › patella
- Rudimentary (congenital) › patella
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 08 · Diseases and Disorders of the Musculoskeletal System and Connective Tissue
ICD-9-CM equivalent
Converter →- 755.64Congenital deformity of knee (joint)approximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about Q74.1
Is Q74.1 billable?
- Yes. Q74.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q74.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q74.1 as a principal diagnosis.
Is Q74.1 a CC or MCC?
- No. Q74.1 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does Q74.1 group to?
- Q74.1 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.
What is the ICD-9 code for Q74.1?
- The CMS General Equivalence Mappings map Q74.1 to ICD-9-CM 755.64.