ICD-10-CM Code Q79.8

Other congenital malformations of musculoskeletal system

Version 2020 Billable Code POA Exempt

Valid for Submission

Q79.8 is a billable code used to specify a medical diagnosis of other congenital malformations of musculoskeletal system. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code Q79.8 might also be used to specify conditions or terms like aberrant forearm flexor muscle, aberrant muscle of the upper limb, accessory ossification center, accessory skeletal muscle, alopecia, onychodysplasia, hypohidrosis, deafness ectodermal dysplasia, amyoplasia congenita disruptive sequence, etc The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

Short Description:Other congenital malformations of musculoskeletal system
Long Description:Other congenital malformations of musculoskeletal system

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code Q79.8:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Absence of muscle
  • Absence of tendon
  • Accessory muscle
  • Amyotrophia congenita
  • Congenital constricting bands
  • Congenital shortening of tendon
  • Poland syndrome

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code Q79.8 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Aberrant forearm flexor muscle
  • Aberrant muscle of the upper limb
  • Accessory ossification center
  • Accessory skeletal muscle
  • Alopecia, onychodysplasia, hypohidrosis, deafness ectodermal dysplasia
  • Amyoplasia congenita disruptive sequence
  • Amyotrophia congenita
  • Angioosteohypotrophic syndrome
  • Aplasia of muscle
  • Congenital abnormal fusion of carpal bone
  • Congenital absence of abdominal muscle
  • Congenital absence of left pectoral muscle
  • Congenital absence of muscle AND/OR tendon
  • 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 anomaly of body cavity
  • Congenital anomaly of cartilage
  • Congenital anomaly of hyoid bone
  • Congenital bilateral short Achilles tendons
  • Congenital contracture of gastrocnemius muscle
  • Congenital contracture of left gastrocnemius muscle
  • Congenital contracture of right gastrocnemius muscle
  • Congenital hepatomegaly
  • Congenital hyperplasia of muscle
  • Congenital hypoplasia of hyoid bone
  • Congenital muscular hypertrophy-cerebral syndrome
  • Congenital short Achilles tendon
  • Congenital short costocoracoid ligament
  • Congenital short quadriceps
  • Congenital shortening of tendon
  • Connective tissue disorder due to lysyl hydroxylase-3 deficiency
  • Constricting band of extremity
  • Constriction ring syndrome
  • Contracture of muscle of left lower leg
  • Contracture of muscle of right lower leg
  • Dermatoosteolysis Kirghizian type
  • Ectodermal dysplasia with tooth-nail defects
  • 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
  • Muscular hypertrophy, hepatomegaly, polyhydramnios syndrome
  • Myostatin related hypertrophy of muscle
  • Poland anomaly
  • Polyneuropathy, intellectual disability, acromicria, premature menopause syndrome
  • Premature ovarian failure
  • Short Achilles tendon
  • Thoracoceloschisis

Diagnostic Related Groups

The ICD-10 code Q79.8 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2019 through 09/30/2020.


Present on Admission (POA)

Q79.8 is exempt from POA reporting - The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement. Review other POA exempt codes here .

CMS POA Indicator Options and Definitions
POA Indicator CodePOA Reason for CodeCMS will pay the CC/MCC DRG?
YDiagnosis was present at time of inpatient admission.YES
NDiagnosis was not present at time of inpatient admission.NO
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.NO
WClinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.YES
1Unreported/Not used - Exempt from POA reporting. NO

Convert Q79.8 to ICD-9

  • 756.81 - Absence of muscle/tendon (Approximate Flag)
  • 756.82 - Accessory muscle (Approximate Flag)
  • 756.89 - Soft tissue anomaly NEC (Approximate Flag)
  • 756.9 - Musculoskel anom NEC/NOS (Approximate Flag)

Code Classification

  • Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • Congenital malformations and deformations of the musculoskeletal system (Q65-Q79)
      • Congenital malformations of musculoskeletal system, NEC (Q79)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients

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.

A birth defect may affect how the body looks, works or both. Some birth defects like cleft lip or neural tube defects are structural problems that can be easy to see. To find others, like heart defects, doctors use special tests. Birth defects can range from mild to severe. Causes can include

  • Genetics
  • Exposures to medicines or chemicals. For example, alcohol abuse can cause fetal alcohol syndrome.
  • Infections during pregnancy
  • Certain medicines. Before you get pregnant, talk to your health care provider about any medicines you take.
  • Not getting enough of certain nutrients. For example, not getting enough folic acid before and during pregnancy is a key factor in causing neural tube defects.

For most birth defects, the cause is unknown.

Health care providers can diagnose certain birth defects during pregnancy, with prenatal tests. That's why it important to get regular prenatal care. Other birth defects may not be found until after the baby is born. Sometimes the defect is obvious right away. Other times, the health care provider may not discover it until later in life.

Babies with birth defects often need special care and treatments. The treatments may include surgery, medicines, assistive devices, and therapies.

Centers for Disease Control and Prevention

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