2026 ICD-10-CM Diagnosis Code Q73.1Phocomelia, unspecified limb(s)

ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q73

ICD-10-CM Q73.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q73.1 is a billable ICD-10-CM diagnosis code for phocomelia, unspecified limb(s). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 564 through 566. The code is exempt from POA reporting. Coders also document this condition as congenital conductive hearing loss. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Musculoskeletal congenital conditions.

Code Identity

ICD-10-CM Code
Q73.1
Billable Status
Yes — Valid for Submission
Code Describes
Phocomelia, unspecified limb(s)
Short Description
Phocomelia, unspecified limb(s)
Same as the full description in the CMS dataset.
Parent Code
Q73
Reduction defects of unspecified limb

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ65-Q79Congenital malformations and deformations of the musculoskeletal system
CategoryQ73Reduction defects of unspecified limb
This CodeQ73.1Phocomelia, unspecified limb(s)

Present on Admission (POA)Billing

Q73.1 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Congenital conductive hearing loss
  • DK phocomelia syndrome
  • Phocomelia
  • Phocomelia, ectrodactyly, deafness and sinus arrhythmia syndrome
  • Roberts-SC phocomelia syndrome

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Phocomelia NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Phocomelia

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 Q73.1 to ICD-9-CMHistory

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

ICD-9-CM
755.4 Reduct deform limb NOS
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Q73.1Overview

Is Q73.1 (Reduction defects of unspecified limb) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report phocomelia, unspecified limb(s) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Q73.1 group to?

When phocomelia, unspecified limb(s) is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 565, 566, with relative weights from 0.7493 to 1.5436 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Q73.1 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 phocomelia, unspecified limb(s) on inpatient claims.

What is the ICD-9 equivalent of Q73.1?

Under the General Equivalence Mappings, phocomelia, unspecified limb(s) converts to ICD-9-CM 755.4 (reduct deform limb NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.