ICD-10-CM 2027 diagnosis code
Q79.8Other congenital malformations of musculoskeletal system
Q79.8 is a valid, billable ICD-10-CM code for other congenital malformations of musculoskeletal system. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Acromicria, ICD-10 code for Muscle agenesis, ICD-10 code for Poland syndrome, ICD-10 code for Amyoplasia congenita.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About Q79.8
Q79.8 is the ICD-10-CM diagnosis code for other congenital malformations of musculoskeletal system. It belongs to category Q79 (congenital malformations of musculoskeletal system, not elsewhere classified), block Q65-Q79 (congenital malformations and deformations of the musculoskeletal system) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within Q79, choose Q79.8 (Other congenital malformations of musculoskeletal system) only when documentation doesn't support a more specific option: congenital diaphragmatic hernia (Q79.0), other congenital malformations of diaphragm (Q79.1), Exomphalos (Q79.2), gastroschisis (Q79.3), prune belly syndrome (Q79.4), other congenital malformations of abdominal wall (Q79.5), Ehlers-Danlos syndromes (Q79.6) and congenital malformation of musculoskeletal system, unspecified (Q79.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 564 (Other Musculoskeletal System and Connective Tissue Diagnoses with MCC, relative weight 1.4908), DRG 565 (Other Musculoskeletal System and Connective Tissue Diagnoses with CC, relative weight 0.9783) and DRG 566 (Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC, relative weight 0.7378), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 756.81 (absence of muscle and tendon), 756.82 (accessory muscle), 756.89 (other specified anomalies of muscle, tendon, fascia, and connective tissue) and 1 more.
Coding notes
- Absence of muscle
- Absence of tendon
- Accessory muscle
- Amyotrophia congenita
- Congenital constricting bands
- Congenital shortening of tendon
- Poland syndrome
Notes that apply from higher levels
Instructions written at a parent level also apply to Q79.8.
› From Q79 Congenital malformations of musculoskeletal system, not elsewhere classified
- congenital (sternomastoid) torticollis (Q68.0)
Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.
Alphabetic index entries
28 entriesTerms in the official ICD-10-CM index that lead to Q79.8.
- Absence (of) (organ or part) (complete or partial) › muscle (congenital) (pectoral)
- Absence (of) (organ or part) (complete or partial) › tendon (congenital)
- Accessory (congenital) › bone NEC
- Accessory (congenital) › muscle
- Accessory (congenital) › tendon
- Acromicria, acromikria
- Agenesis › muscle
- Agenesis › musculoskeletal system NEC
- Agenesis › tendon
- Amyoplasia congenita
- Amyotrophia, amyotrophy, amyotrophic › congenita
- Band (s) › constricting, congenital
- Contraction (s), contracture, contracted › ligament › congenital
- Contraction (s), contracture, contracted › muscle (postinfective) (postural) NEC › congenital
- Diastasis › muscle › congenital
- Dysplasia › muscle
- Fusion, fused (congenital) › bone
- Hypoplasia, hypoplastic › muscle
- Krabbe's › syndrome, congenital muscle hypoplasia
- Myelo-osteo-musculodysplasia hereditaria
- Poland syndrome
- Short, shortening, shortness › tendon › congenital
- Supernumerary (congenital) › bone
- Supernumerary (congenital) › muscle
- Syndrome › Krabbe's congenital muscle hypoplasia
- Syndrome › Touraine's
- Thoracogastroschisis (congenital)
- Touraine's syndrome
Codes whose notes reference Q79.8
- Q83Excludes2
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 08 · Diseases and Disorders of the Musculoskeletal System and Connective Tissue
ICD-9-CM equivalent
Converter →- 756.81Absence of muscle and tendonapproximate
- 756.82Accessory muscleapproximate
- 756.89Other specified anomalies of muscle, tendon, fascia, and connective tissueapproximate
- 756.9Other and unspecified anomalies of musculoskeletal systemapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about Q79.8
Is Q79.8 billable?
- Yes. Q79.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q79.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q79.8 as a principal diagnosis.
Is Q79.8 a CC or MCC?
- No. Q79.8 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does Q79.8 group to?
- Q79.8 is used in the MS-DRG v44.0 logic for MS-DRG 564 (Other Musculoskeletal System and Connective Tissue Diagnoses with MCC), MS-DRG 565 (Other Musculoskeletal System and Connective Tissue Diagnoses with CC) and MS-DRG 566 (Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for Q79.8?
- The CMS General Equivalence Mappings map Q79.8 to ICD-9-CM 756.81, 756.82, 756.89 and 756.9.