M20 ICD-10-CM Code: Acquired deformities of fingers and toes
M20 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Other joint disorders (M20-M25)
M20
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceAcquired deformities of fingers and toes
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for M20. Check the code and parent instructions in the Code Book.
Excludes 2
Official- arthropathic psoriasis (L40.5-)Inherited from M00-M99, M20-M25
- certain conditions originating in the perinatal period (P04-P96)Inherited from M00-M99, M20-M25
- certain infectious and parasitic diseases (A00-B99)Inherited from M00-M99, M20-M25
- compartment syndrome (traumatic) (T79.A-)Inherited from M00-M99, M20-M25
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from M00-M99, M20-M25
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from M00-M99, M20-M25
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from M00-M99, M20-M25
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from M00-M99, M20-M25
- neoplasms (C00-D49)Inherited from M00-M99, M20-M25
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from M00-M99, M20-M25
- joints of the spine (M40-M54)Inherited from M00-M99, M20-M25
Related Codes
Includes
OfficialNo Includes notes are included in this display for M20. Check the code and parent instructions in the Code Book.
Excludes 1
Official- acquired absence of fingers and toes (Z89.-)
- congenital absence of fingers and toes (Q71.3-, Q72.3-)
- congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-)
Code First
OfficialNo Code First sequencing instructions are included in this display for M20. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for M20. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for M20. Check the code and parent instructions in the Code Book.
Served edition: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- M20
- Description
- Acquired deformities of fingers and toes
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
M20 is the ICD-10-CM diagnosis code for acquired deformities of fingers and toes. M20 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other joint disorders (m20-m25).
Header codes like M20 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for M20 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.