2026 ICD-10-CM Diagnosis Code Q78.5Metaphyseal dysplasia

ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q78

ICD-10-CM Q78.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q78.5 is a billable ICD-10-CM diagnosis code for metaphyseal dysplasia. 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
Q78.5
Billable Status
Yes — Valid for Submission
Code Describes
Metaphyseal dysplasia
Short Description
Metaphyseal dysplasia
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 CodeQ78.5Metaphyseal dysplasia

Present on Admission (POA)Billing

Q78.5 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.

  • Acroscyphodysplasia
  • Autosomal recessive spondylometaphyseal dysplasia Megarbane type
  • Axial spondylometaphyseal dysplasia
  • Bowing of upper limb
  • Congenital maxillary hypoplasia
  • Craniometaphyseal dysplasia
  • Craniometaphyseal dysplasia - mild type
  • Craniometaphyseal dysplasia - severe type
  • Hypoplasia of maxillary bone
  • Intrauterine growth restriction, metaphyseal dysplasia, adrenal hypoplasia congenita, and genital anomaly syndrome
  • Kozlowski spondylometaphyseal dysplasia
  • Lentiglobus
  • Metaphyseal chondrodysplasia
  • Metaphyseal chondrodysplasia, Jansen type
  • Metaphyseal chondrodysplasia, McKusick type
  • Metaphyseal chondrodysplasia, Schmid type
  • Metaphyseal chondrodysplasia, Sedaghatian type
  • Metaphyseal chondrodysplasia, Spahr type
  • Metaphyseal dysplasia Braun Tinschert type
  • Metaphyseal dysplasia, maxillary hypoplasia, brachydactyly syndrome
  • Microphakia
  • Microspherophakia
  • Microspherophakia with metaphyseal dysplasia syndrome
  • Osteosclerosis
  • Osteosclerotic metaphyseal dysplasia
  • Overgrowth, metaphyseal undermodeling, spondylar dysplasia syndrome
  • Pyle metaphyseal dysplasia
  • Regressive spondylometaphyseal dysplasia
  • SBDS-related severe neonatal spondylometaphyseal dysplasia
  • Spherophakia
  • Spondyloenchondrodysplasia
  • Spondylometaphyseal dysplasia
  • Spondylometaphyseal dysplasia - Sutcliffe type
  • Spondylometaphyseal dysplasia A4 type
  • Spondylometaphyseal dysplasia, bowed forearms, facial dysmorphism syndrome
  • Spondylometaphyseal dysplasia, corneal dystrophy syndrome
  • Ulna metaphyseal dysplasia syndrome

Tabular List NotesGuidance

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

Inclusion Terms

  • Pyle's syndrome

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.

    • Bakwin-Krida syndrome(metaphyseal dysplasia)
    • Disease, diseased
      • Pyle (-Cohn) (metaphyseal dysplasia)
    • Dysplasia
      • metaphyseal
    • Pyle's syndrome
    • Syndrome
      • Bakwin-Krida

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

  • Osteopetrosis

    excessive formation of dense trabecular bone leading to pathological fractures; osteitis; splenomegaly with infarct; anemia; and extramedullary hemopoiesis (hematopoiesis, extramedullary).

  • Osteosclerosis

    an abnormal hardening or increased density of bone tissue.

  • Spherophakia

    a congenital disorder of the eye where the lens is abnormally small and spherical.

  • Weill-Marchesani Syndrome 1|Congenital Mesodermal Dysmorphodystrophy|Spherophakia-Brachymorphia Syndrome|Spherophakia-brachymorphia syndrome|Weill-Marchesani, Autosomal Recessive

    an autosomal recessive subtype of weill-marchesani syndrome caused by mutations in the adamts10 gene, encoding a disintegrin and metalloproteinase with thrombospondin motifs 10.

  • Osteosclerosis

    abnormally high bone density.

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 Q78.5 to ICD-9-CMHistory

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

ICD-9-CM
756.59 Osteodystrophy NEC
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 Q78.5Overview

Is Q78.5 (Other osteochondrodysplasias) a billable code?

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

What MS-DRG does Q78.5 group to?

When metaphyseal dysplasia 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 Q78.5 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 metaphyseal dysplasia on inpatient claims.

What is the ICD-9 equivalent of Q78.5?

Under the General Equivalence Mappings, metaphyseal dysplasia converts to ICD-9-CM 756.59 (osteodystrophy NEC). 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.