2027 ICD-10-CM Diagnosis Code Q79.9Congenital malformation of musculoskeletal system, unspecified
ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q79
- Billable — Valid for Submission
- POA Exempt
- Chronic Condition
Q79.9 is a billable ICD-10-CM diagnosis code for congenital malformation of musculoskeletal system, unspecified. 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
Code Classification
Present on Admission (POA)Billing
Q79.9 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.
- 46,XX disorder of sex development with skeletal anomalies syndrome
- Aberrant muscle of the lower limb
- Abnormally short long bone
- Ambiguous genitalia
- Aplasia of bone of axial skeleton
- Bone absent
- Brain malformations, musculoskeletal abnormalities, facial dysmorphism, intellectual disability syndrome
- Cerebrofacioarticular syndrome
- CODAS syndrome
- Combined malformation of central nervous system and skeletal muscle
- Congenital abnormal cone shape of epiphysis with epiphyseal arrest
- Congenital abnormal slender shape of diaphysis of long bone
- Congenital abnormal slender shape of long bone
- Congenital abnormal triangular shape of epiphysis
- Congenital anomaly of abdomen
- Congenital anomaly of bone and joint
- Congenital anomaly of muscle AND/OR tendon
- Congenital anomaly of musculoskeletal structure of trunk
- Congenital anomaly of musculoskeletal system
- Congenital anomaly of skeletal bone
- Congenital deformity of musculoskeletal system
- Congenital lordosis deformity of spine
- Congenital lordosis deformity of spine due to congenital malformation of skeletal bone
- Cyprus facial neuromusculoskeletal syndrome
- Marfanoid habitus, facial dysmorphism, skeletal abnormality, heart defect syndrome
- Marfanoid physique
- Multiple bony abnormalities
- Muscle eye brain disease
- Nathalie syndrome
- Neurodevelopmental disorder, craniofacial dysmorphism, cardiac defect, skeletal anomalies syndrome
- SCARF syndrome
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q79.9: its own notes plus those printed at Q79 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 anomaly of musculoskeletal system NOS
- Congenital deformity of musculoskeletal system NOS
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 (sternomastoid) torticollis (Q68.0)
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
congenital Q79.9
bursa, congenital Q79.9
ligament (acquired) See: Disorder, ligament;
congenital Q79.9
congenital Q79.9
musculoskeletal system (acquired) M95.9
congenital Q79.9
abnormal, bone Q79.9
Elongated, elongation (congenital) See Also: Distortion;
bone Q79.9
Malformation (congenital) See Also: Anomaly;
bone Q79.9
bursa Q79.9
musculoskeletal system Q79.9
tendon Q79.9
Rudimentary (congenital) See Also: Agenesis;
bone Q79.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 Q79.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q79.9Overview
What is the ICD-10 code for congenital malformation of musculoskeletal system, unspecified?
The ICD-10-CM code for congenital malformation of musculoskeletal system, unspecified is Q79.9 (sometimes written as Q799). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Q79.9 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report congenital malformation of musculoskeletal system, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Q79.9 group to?
When congenital malformation of musculoskeletal system, unspecified 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 Q79.9 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 congenital malformation of musculoskeletal system, unspecified 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 Q79.9?
Under the General Equivalence Mappings, congenital malformation of musculoskeletal system, unspecified converts to ICD-9-CM 756.9 (musculoskel anom NEC/NOS). The mapping is approximate, so confirm the match fits the documentation.
