M21.40
BillableFlat foot [pes planus] (acquired), unspecified foot
Flat foot [pes planus] (acquired), unspecified foot
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(2)
Also Known As / Clinical Terms(37)
SNOMED CT
- Acquired flaccid flat foot44480001
- Acquired flexible flat foot44480001
- Acquired non-rigid flat foot44480001
- Fallen arch53226007
- Flat foot53226007
- Low medial arch of foot53226007
- Pes planus53226007
- Talipes planus53226007
- Acquired rigid flat foot90374001
- Acquired spastic flat foot90374001
- Hypermobile flat foot203531001
- Rigid flat foot203532008
- Peroneal spastic flat foot203533003
- Acquired pes planus203534009
- Broad foot766303001
- Metatarsus latus766303001
- Spread foot766303001
- Talipes transversoplanus766303001
Clinical Terms
- Pes planus
- Rigid flat foot
- Acquired non-rigid flat foot
- Broad foot
- Acquired rigid flat foot
- Low medial arch of foot
- Hypermobile flat foot
- Talipes planus
- Peroneal spastic flat foot
- Flat foot
- Metatarsus latus
- Talipes transversoplanus
- Acquired pes planus
- Acquired flexible flat foot
- Acquired spastic flat foot
- Spread foot
- Acquired flaccid flat foot
- Fallen arch
Frequently Asked Questions
What is the ICD-10 code for flat foot [pes planus] (acquired), unspecified foot?
The ICD-10-CM code for flat foot [pes planus] (acquired), unspecified foot is M21.40. The full clinical description is "Flat foot [pes planus] (acquired), unspecified foot". M21.40 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code M21.40 mean?
ICD-10-CM code M21.40 represents “Flat foot [pes planus] (acquired), unspecified foot”. 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 M21.40 a billable code?
Yes, M21.40 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is M21.40 in?
M21.40 is in Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (codes M00-M99).
What codes cannot be used with M21.40?
M21.40 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); and 1 more.
What SNOMED CT codes does M21.40 map to?
M21.40 maps to 8 SNOMED CT concepts: 44480001, 203534009, 90374001, 766303001, 53226007, and 3 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for M21.40?
M21.40 is linked to 1 UMLS Concept Unique Identifier: C2894503. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does M21.40 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like flat foot [pes planus] (acquired), unspecified foot 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 M21.40?
There is no direct ICD-11 mapping available for M21.40 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.