2027 ICD-10-CM Diagnosis Code Q74.1Congenital malformation of knee

ICD-10-CM Codes›Q00-Q99›Q65-Q79›s

ICD-10-CM Q74.1
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Q74.1 is a billable ICD-10-CM diagnosis code for congenital malformation of knee. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 564 through 566. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Musculoskeletal congenital conditions.

Code Identity

ICD-10-CM Code
Q74.1
Billable Status
Yes — Valid for Submission
Code Describes
Congenital malformation of knee
Short Description
Congenital malformation of knee
Same as the full description in the CMS dataset.
Parent Code
Q74
Other congenital malformations of limb(s)

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ65-Q79Congenital malformations and deformations of the musculoskeletal system
CategorysOther congenital malformations of limb (Q74)
This CodeQ74.1Congenital malformation of knee

Present on Admission (POA)Billing

Q74.1 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Congenital malformations and deformations of the musculoskeletal system (Q65-Q79).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Absent patella
  • Aniridia and absent patella syndrome
  • Aplasia of patella
  • Bandy legged
  • Bifid patella
  • Bilateral congenital knee dislocation
  • Bilateral congenital patella dislocation
  • Bilateral disorder of patellofemoral joints
  • Blepharophimosis, intellectual disability syndrome/genitopatellar overlap syndrome
  • Congenital absence of patella
  • Congenital aniridia
  • Congenital anomaly of patella
  • Congenital deformity of bilateral knee joints
  • Congenital deformity of left knee joint
  • Congenital deformity of right knee joint
  • Congenital dislocation of left knee
  • Congenital dislocation of left patella
  • Congenital dislocation of patella
  • Congenital dislocation of right knee
  • Congenital dislocation of right patella
  • Congenital dysplasia of joint of knee
  • Congenital dysplasia of joint of left knee
  • Congenital dysplasia of joint of right knee
  • Congenital genu valgum
  • Congenital genu valgum of bilateral knees
  • Congenital genu valgum of left knee
  • Congenital genu valgum of right knee
  • Congenital genu varum
  • Congenital genu varum of bilateral knees
  • Congenital genu varum of left knee
  • Congenital genu varum of right knee
  • Congenital hypoplasia of patella
  • Coxopodopatellar syndrome
  • Dislocation of joint of knee due to congenital dysplasia of joint of knee
  • Dislocation of joint of left knee due to congenital dysplasia of joint of left knee
  • Dislocation of joint of right knee due to congenital dysplasia of joint of right knee
  • Dislocation of left patellofemoral joint
  • Dislocation of right patellofemoral joint
  • Ear, patella, short stature syndrome
  • Failure of tooth eruption
  • Genitopatellar syndrome
  • Hyperphalangy
  • Knee joint valgus deformity
  • Non-eruption of teeth, maxillary hypoplasia, genu valgum syndrome
  • Patella dysplasia
  • Scypho-patellar dysplasia
  • Triphalangeal thumb
  • Triphalangeal thumb and dislocation of patella syndrome

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Q74.1: its own notes plus those printed at Q74 and Chapter 17. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Congenital absence of patella
  • Congenital dislocation of patella
  • Congenital genu valgum
  • Congenital genu varum
  • Rudimentary patella

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On Q74.1 itself
  • congenital dislocation of knee (Q68.2)
  • congenital genu recurvatum (Q68.2)
  • nail patella syndrome (Q87.2)
From Q74 Other congenital malformations of limb(s) applies to 6 codes

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • inborn errors of metabolism (E70-E88)

Notes

General instructions on how these codes are used.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • Codes from this chapter are not for use on maternal records

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name Q74.1, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming Q74.1: they are not reported together with it, unless the two conditions are unrelated.

  • M20 Acquired deformities of fingers and toes
    congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-) names Q74.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MAL008
Musculoskeletal congenital conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Birth Defects

A birth defect is a problem that happens while a baby is developing in the mother's body. Most birth defects happen during the first 3 months of pregnancy. One out of every 33 babies in the United States is born with a birth defect.

The full article covers:

  • What are birth defects?
  • What causes birth defects?
  • Who is at risk of having a baby with birth defects?
  • How are birth defects diagnosed?
  • What are the treatments for birth defects?
  • Can birth defects be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Q74.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
755.64 Cong knee deformity
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Q74.1Overview

What is the ICD-10 code for congenital malformation of knee?

The ICD-10-CM code for congenital malformation of knee is Q74.1 (sometimes written as Q741). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Q74.1 (Other congenital malformations of limb(s)) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report congenital malformation of knee on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Q74.1 group to?

When congenital malformation of knee is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 566, 565, with relative weights from 0.7374 to 1.4909 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Q74.1 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for congenital malformation of knee on inpatient claims. The code appears in the Congenital malformations and deformations of the musculoskeletal system (Q65-Q79) range of the CMS exempt list.

Can Q74.1 be reported with Q68.2?

Not as a rule. The Excludes1 note on Q74.1 lists "congenital dislocation of knee (Q68.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).