1. ICD-10-CM Codes
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2. Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities
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3. Q65-Q79 Congenital malformations and deformations of the musculoskeletal system
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4. Q78- Other osteochondrodysplasias
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5. 2021 ICD-10-CM Diagnosis Code Q78.4

2021 ICD-10-CM Diagnosis Code Q78.4

Enchondromatosis

2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt

• Q78.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2021 edition of ICD-10-CM Q78.4 became effective on October 1, 2020.
• This is the American ICD-10-CM version of Q78.4 - other international versions of ICD-10 Q78.4 may differ.

• Maffucci syndrome
• Multiple enchondromatosis

• A rare benign disorder characterized by lack of normal endchondral ossification, and the growth of multiple enchondromas. It primarily affects the bones of the hand, in children and young adults. Extent of the disease varies; in some cases, neoplastic involvement may be wide spread causing considerable deformity.
• A rare benign disorder characterized by lack of normal endochondral ossification, and the growth of multiple enchondromas. It primarily affects the bones of the hand, in children and young adults. Extent of the disease varies; in some cases, neoplastic involvement may be wide spread causing considerable deformity.
• Benign growths of cartilage in the metaphyses of several bones.

• Q78.4 is considered exempt from POA reporting.

• 564 Other musculoskeletal system and connective tissue diagnoses with mcc
• 565 Other musculoskeletal system and connective tissue diagnoses with cc
• 566 Other musculoskeletal system and connective tissue diagnoses without cc/mcc

Convert Q78.4 to ICD-9-CM

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change

• Chondrodysplasia Q78.9
  ICD-10-CM Diagnosis Code Q78.9

  Osteochondrodysplasia, unspecified

  2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt

  Applicable To

  • Chondrodystrophy NOS
  • Osteodystrophy NOS
  • with hemangioma Q78.4
• Chondromatosis - see also Neoplasm, cartilage, uncertain behavior
  • internal Q78.4
• Dyschondroplasia Q78.4 (with hemangiomata)
• Enchondromatosis Q78.4 (cartilaginous) (multiple)
• Maffucci's syndrome Q78.4
• Ollier's disease Q78.4
• Osteochondromatosis D48.0
  ICD-10-CM Diagnosis Code D48.0

  Neoplasm of uncertain behavior of bone and articular cartilage

  2016 2017 2018 2019 2020 2021 Billable/Specific Code

  Type 1 Excludes

  • neoplasm of uncertain behavior of cartilage of ear (D48.1)
  • neoplasm of uncertain behavior of cartilage of larynx (D38.0)
  • neoplasm of uncertain behavior of cartilage of nose (D38.5)
  • neoplasm of uncertain behavior of connective tissue of eyelid (D48.1)
  • neoplasm of uncertain behavior of synovia (D48.1)
  • syndrome Q78.4

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.