2027 ICD-10-CM Diagnosis Code Q77.4Achondroplasia
ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q77
- Billable — Valid for Submission
- POA Exempt
- Chronic Condition
Q77.4 is a billable ICD-10-CM diagnosis code for achondroplasia. 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. Coders also document this condition as acanthosis nigricans. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Musculoskeletal congenital conditions.
Code Identity
Code Classification
Present on Admission (POA)Billing
Q77.4 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.
- Acanthosis nigricans
- Achondrogenesis
- Achondroplasia
- Hypochondroplasia
- Lethal chondrodysplasia with fragmented bone
- Severe achondroplasia, developmental delay, acanthosis nigricans syndrome
- Severe combined immunodeficiency with low T- and B-cell numbers
- Short-limb skeletal dysplasia with severe combined immunodeficiency
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q77.4: its own notes plus those printed at Q77 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.
- Hypochondroplasia
- Osteosclerosis congenita
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
- congenital myotonic chondrodystrophy (G71.13)
Notes
General instructions on how these codes are used.
- 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 Q77.4, its category, or a range that includes it.
Excludes1 3
These codes carry an Excludes1 note naming Q77.4: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
fetalis Q77.4
Dwarfism See Also: Short, stature; E34.328
achondroplastic Q77.4
hypochondroplastic Q77.4
Hypochondroplasia Q77.4
congenita Q77.4
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Achondroplasia
an autosomal dominant disorder that is the most frequent form of short-limb dwarfism. affected individuals exhibit short stature caused by rhizomelic shortening of the limbs, characteristic facies with frontal bossing and mid-face hypoplasia, exaggerated lumbar lordosis, limitation of elbow extension, genu varum, and trident hand. (online mendelian inheritance in man, http://www.ncbi.nlm.nih.gov/omim, mim#100800, april 20, 2001)
Patient EducationClinical
Dwarfism
People with dwarfism have short stature. This means that their height is under 4' 10" as an adult. They are usually of normal intelligence. Dwarfism most often does happen in families where both parents are of average height.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Q77.4 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q77.4Overview
What is the ICD-10 code for achondroplasia?
The ICD-10-CM code for achondroplasia is Q77.4 (sometimes written as Q774). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Q77.4 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report achondroplasia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Q77.4 group to?
When achondroplasia 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 Q77.4 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 achondroplasia on inpatient claims. The code appears in the Congenital malformations and deformations of the musculoskeletal system (Q65-Q79) range of the CMS exempt list.
What is the ICD-9 equivalent of Q77.4?
Under the General Equivalence Mappings, achondroplasia converts to ICD-9-CM 756.4 (chondrodystrophy). The mapping is approximate, so confirm the match fits the documentation.
