2027 ICD-10-CM Diagnosis Code Q79.8Other congenital malformations of musculoskeletal system
ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q79
- Billable — Valid for Submission
- POA Exempt
- Chronic Condition
Q79.8 is a billable ICD-10-CM diagnosis code for other congenital malformations of musculoskeletal system. 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
Q79.8 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.
- Aberrant forearm flexor muscle
- Aberrant muscle of the upper limb
- Accessory ossification center
- Accessory skeletal muscle
- Alopecia, onychodysplasia, hypohidrosis, deafness ectodermal dysplasia
- Amyotrophia congenita
- Aplasia of biceps brachii
- Aplasia of muscle
- Aplasia of muscle of abdominal wall
- Aplasia of muscle of limb
- Aplasia of muscle of pelvis
- Aplasia of muscle of shoulder
- Aplasia of muscle of thigh
- Aplasia of muscle of upper arm
- Aplasia of muscle of upper limb
- Aplasia of pectoral muscle
- Aplasia of pectoralis major muscle
- Aplasia of quadriceps femoris muscle
- Aplasia of triceps brachii
- Autosomal dominant myopia, midfacial retrusion, sensorineural hearing loss, rhizomelic dysplasia syndrome
- Bilateral muscle contracture of ankle regions
- Bilateral muscle contracture of lower legs
- Chondrolysis of articular cartilage
- Congenital abnormal fusion of carpal bone
- Congenital absence of abdominal muscle
- Congenital absence of bilateral pectoral muscles
- Congenital absence of left pectoral muscle
- Congenital absence of muscle AND/OR tendon
- Congenital absence of part of upper arm
- Congenital absence of pectoral muscle
- Congenital absence of quadriceps muscle
- Congenital absence of right pectoral muscle
- Congenital absence of skeletal bone
- Congenital absence of skeletal muscle
- Congenital absence of soft tissue of distal phalanx of finger
- Congenital absence of tendon
- Congenital amyoplasia
- Congenital anomaly of body cavity
- Congenital anomaly of cartilage
- Congenital anomaly of hyoid bone
- Congenital bilateral short Achilles tendons
- Congenital chondrolysis
- Congenital contracture of bilateral gastrocnemius
- Congenital contracture of gastrocnemius muscle
- Congenital contracture of left gastrocnemius muscle
- Congenital contracture of right gastrocnemius muscle
- Congenital dysplasia of bone caused by drug
- Congenital hepatomegaly
- Congenital hyperplasia of muscle
- Congenital hypoplasia of biceps brachii muscle
- Congenital hypoplasia of deltoid muscle
- Congenital hypoplasia of hyoid bone
- Congenital hypoplasia of latissimus dorsi muscle
- Congenital hypoplasia of muscle of abdominal wall
- Congenital hypoplasia of muscle of limb
- Congenital hypoplasia of muscle of neck
- Congenital hypoplasia of muscle of pelvis
- Congenital hypoplasia of muscle of shoulder
- Congenital hypoplasia of muscle of thigh
- Congenital hypoplasia of muscle of upper arm
- Congenital hypoplasia of muscle of upper limb
- Congenital hypoplasia of pectoral muscle
- Congenital hypoplasia of pectoralis major muscle
- Congenital hypoplasia of pectoralis minor muscle
- Congenital hypoplasia of posterior crural muscle
- Congenital hypoplasia of quadriceps femoris muscle
- Congenital hypoplasia of serratus anterior muscle
- Congenital hypoplasia of triceps brachii muscle
- Congenital muscular hypertrophy-cerebral syndrome
- Congenital short Achilles tendon
- Congenital short costocoracoid ligament
- Congenital short left Achilles tendon
- Congenital short quadriceps
- Congenital short right Achilles tendon
- Congenital shortening of tendon
- Connective tissue disorder due to lysyl hydroxylase-3 deficiency
- Constricting band of extremity
- Constriction ring syndrome
- Cutis laxa, autosomal recessive
- Dermatoosteolysis Kirghizian type
- Ectopic bone tissue, congenital
- Geroderma osteodysplastica
- Hadziselimovic syndrome
- Hypoplasia of muscle
- Incomplete ossification of hyoid bone
- Intellectual disability, developmental delay, contracture syndrome
- KBG syndrome
- King Denborough syndrome
- Micromelia
- Muscle contracture of left ankle
- Muscle contracture of right ankle
- Muscular hypertrophy, hepatomegaly, polyhydramnios syndrome
- Myostatin related hypertrophy of muscle
- Poland anomaly
- Polyneuropathy, intellectual disability, acromicria, premature menopause syndrome
- Premature ovarian insufficiency
- Segmental progressive overgrowth syndrome with fibroadipose hyperplasia
- Skeletal dysplasia
- Structural abnormality of abdominal wall muscle
- Thoracoceloschisis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q79.8: 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.
- Absence of muscle
- Absence of tendon
- Accessory muscle
- Amyotrophia congenita
- Congenital constricting bands
- Congenital shortening of tendon
- Poland syndrome
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.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name Q79.8, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Acromicria, acromikria Q79.8
Amyoplasia congenita Q79.8
Contraction (s), contracture, contracted
ligament See Also: Disorder, ligament;
congenital Q79.8
muscle (postinfective) (postural) NEC M62.40
congenital Q79.8
congenital Q79.8
Poland syndrome Q79.8
tendon See Also: Contraction, tendon;
congenital Q79.8
Syndrome See Also: Disease;
Touraine's Q79.8
Touraine's syndrome Q79.8
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Arthrogryposis
persistent flexure or contracture of a joint.Poland Syndrome
a syndrome which is characterized by symbrachydactyly and aplasia of the sternal head of pectoralis major.
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 Q79.8 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q79.8Overview
What is the ICD-10 code for other congenital malformations of musculoskeletal system?
The ICD-10-CM code for other congenital malformations of musculoskeletal system is Q79.8 (sometimes written as Q798). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Q79.8 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other congenital malformations of musculoskeletal system on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Q79.8 group to?
When other congenital malformations of musculoskeletal system 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 Q79.8 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 other congenital malformations of musculoskeletal system 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 Q79.8?
Under the General Equivalence Mappings, other congenital malformations of musculoskeletal system converts to ICD-9-CM 756.81 (absence of muscle/tendon), 756.82 (accessory muscle), and 756.89 (soft tissue anomaly NEC). The mapping is approximate, so confirm the match fits the documentation.
