M21.20
BillableFlexion deformity, unspecified site
Flexion deformity, unspecified site
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •arthropathic psoriasisL40.5
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •compartment syndrome (traumatic)A-)T79
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •joints of the spineM40-M54
- •acquired deformities of fingers or toesM20
- •coxa planaM91.2
Related Codes(7)
Also Known As / Clinical Terms(44)
SNOMED CT
- Flexion deformity203598005
- Acquired fixed flexion deformity of joint of upper limb281476006
- FFD - Acquired fixed flexion deformity of joint of upper limb281476006
- Acquired fixed flexion deformity of joint of lower limb281491008
- FFD - Acquired fixed flexion deformity of joint of lower limb281491008
- Flexion contracture385522000
- Flexion contracture of joint385522000
UMLS
- Flexed joint that cannot be straightenedC0333068
- Flexion contractureC0333068
- Flexion contracture (morphologic abnormality)C0333068
- Flexion contracture of jointC0333068
- Flexion contracture of joint (disorder)C0333068
- Flexion contracturesC0333068
- Flexion contractures of jointsC0333068
- Flexion deformitiesC0333068
- Flexion deformityC0333068
- Flexion deformity (disorder)C0333068
- Flexion deformity (morphologic abnormality)C0333068
- Flexion deformity, unspecified siteC0333068
- Flexion joint contracturesC0333068
- contracture flexionC0333068
- contractures flexionC0333068
- deformities flexionC0333068
- flexion contractureC0333068
- flexion deformityC0333068
Clinical Terms
- contractures flexion
- FFD - Acquired fixed flexion deformity of joint of lower limb
- Flexion joint contractures
- deformities flexion
- Flexed joint that cannot be straightened
- FFD - Acquired fixed flexion deformity of joint of upper limb
- contracture flexion
- Flexion deformity (morphologic abnormality)
- Acquired fixed flexion deformity of joint of upper limb
- Flexion contractures
- Flexion contractures of joints
- Flexion contracture
- Flexion deformity (disorder)
- Flexion contracture (morphologic abnormality)
- Flexion contracture of joint (disorder)
- Flexion deformity
- Flexion contracture of joint
- Flexion deformities
- Acquired fixed flexion deformity of joint of lower limb
Frequently Asked Questions
What is the ICD-10 code for flexion deformity, unspecified site?
The ICD-10-CM code for flexion deformity, unspecified site is M21.20. The full clinical description is "Flexion deformity, unspecified site". M21.20 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code M21.20 mean?
ICD-10-CM code M21.20 represents “Flexion deformity, unspecified site”. It is classified under Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue and is a billable/specific code that can be used on a claim.
Is M21.20 a billable code?
Yes, M21.20 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is M21.20 in?
M21.20 is in Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (codes M00-M99).
What codes cannot be used with M21.20?
M21.20 has Excludes1 notes indicating codes that cannot be used together with it, including: acquired absence of limb (Z89.-); congenital absence of limbs (Q71-Q73); congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74).
What SNOMED CT codes does M21.20 map to?
M21.20 maps to 4 SNOMED CT concepts: 281491008, 281476006, 385522000, 203598005. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for M21.20?
M21.20 is linked to 1 UMLS Concept Unique Identifier: C0333068. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does M21.20 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like flexion deformity, unspecified site affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of M21.20?
There is no direct ICD-11 mapping available for M21.20 in the WHO crosswalk tables. This may mean the concept is classified differently in ICD-11. Use the ICD-10 to ICD-11 converter to search for related codes.
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.