2026 ICD-10-CM Diagnosis Code Q78.9Osteochondrodysplasia, unspecified

ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q78

ICD-10-CM Q78.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q78.9 is a billable ICD-10-CM diagnosis code for osteochondrodysplasia, unspecified. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Musculoskeletal congenital conditions.

Code Identity

ICD-10-CM Code
Q78.9
Billable Status
Yes — Valid for Submission
Code Describes
Osteochondrodysplasia, unspecified
Short Description
Osteochondrodysplasia, unspecified
Same as the full description in the CMS dataset.
Parent Code
Q78
Other osteochondrodysplasias

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ65-Q79Congenital malformations and deformations of the musculoskeletal system
CategoryQ78Other osteochondrodysplasias
This CodeQ78.9Osteochondrodysplasia, unspecified

Present on Admission (POA)Billing

Q78.9 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.

  • Body height below reference range
  • Cataract, growth hormone deficiency, sensory neuropathy, sensorineural hearing loss, skeletal dysplasia syndrome
  • Chondrodysplasia
  • Chondrodysplasia with disorder of sex development syndrome
  • Chondrodysplasia with joint dislocations gPAPP type
  • Cognitive impairment, coarse facies, heart defects, obesity, pulmonary involvement, short stature, skeletal dysplasia syndrome
  • Congenital osteodystrophy
  • Cutis laxa with osteodystrophy
  • Deafness with onychodystrophy syndrome
  • Dentinogenesis imperfecta
  • DOORS syndrome
  • Dysplasia with decreased bone density
  • Dysplasia with defective mineralization
  • Fountain syndrome
  • Genetic syndromic childhood obesity
  • Goldblatt syndrome
  • Hereditary growth hormone deficiency
  • Hereditary sensory neuropathy
  • Hypoplastic chondrodystrophy
  • Lordosis deformity of spine due to congenital skeletal dysplasia
  • Ossification anomaly with psychomotor developmental delay syndrome
  • Osteochondrodysplasia syndrome
  • Osteodystrophy
  • Premature ovarian failure
  • Pure gonadal dysgenesis
  • Pure gonadal dysgenesis 46,XY
  • Sclerosing dysplasia of bone, ichthyosis, premature ovarian failure syndrome
  • Sensory neuropathy
  • Skeletal dysplasia brachydactyly syndrome
  • Skeletal dysplasia with intellectual disability syndrome
  • Skeletal dysplasia with wormian bone, multiple fractures, dentinogenesis imperfecta syndrome

Tabular List NotesGuidance

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

Inclusion Terms

  • Chondrodystrophy NOS
  • Osteodystrophy 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.

    • Anomaly, anomalous(congenital) (unspecified type)
      • skeleton generalized
    • Anosteoplasia
    • Chondrodysplasia
    • Chondrodystrophy, chondrodystrophia(familial) (fetalis) (hypoplastic)
    • Dysostosis
      • Fairbank's (idiopathic familial generalized osteophytosis)
    • Osteochondrodysplasia
    • Osteodystrophy
    • Osteodystrophy
      • congenital
    • Silfversköld's syndrome
    • Syndrome
      • Silfversköld's

Clinical ClassificationClinical

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

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

Clinical InformationClinical

  • Dentinogenesis Imperfecta

    an autosomal dominant disorder of tooth development characterized by opalescent dentin resulting in discoloration of the teeth. the dentin develops poorly with low mineral content while the pulp canal is obliterated.

  • Dentinogenesis Imperfecta

    a congenital tooth development disorder caused by mutations in the dspp gene. the teeth are weak, discolored, and translucent.

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 Q78.9 to ICD-9-CMHistory

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

ICD-9-CM
756.50 Osteodystrophy 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 Q78.9Overview

Is Q78.9 (Other osteochondrodysplasias) a billable code?

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

What MS-DRG does Q78.9 group to?

When osteochondrodysplasia, unspecified 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 Q78.9 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 osteochondrodysplasia, unspecified on inpatient claims.

What is the ICD-9 equivalent of Q78.9?

Under the General Equivalence Mappings, osteochondrodysplasia, unspecified converts to ICD-9-CM 756.50 (osteodystrophy 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.