ICD-10-CM Codes
M00-M99
M20-M25
M20-
2023 ICD-10-CM Diagnosis Code M20

2023 ICD-10-CM Diagnosis Code M20

Acquired deformities of fingers and toes

2016

2017

2018

2019

2020

2021

2022

2023

Non-Billable/Non-Specific Code

M20 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
The 2023 edition of ICD-10-CM M20 became effective on October 1, 2022.
This is the American ICD-10-CM version of M20 - other international versions of ICD-10 M20 may differ.

Type 1 Excludes

Type 1 Excludes Help

A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as M20. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

acquired absence of fingers and toes (
ICD-10-CM Diagnosis Code Z89
- Z89 Acquired absence of limb
  - Z89.0 Acquired absence of thumb and other finger(s)...
    - Z89.01 Acquired absence of thumb
      Z89.011 Acquired absence of right thumb
      Z89.012 Acquired absence of left thumb
      Z89.019 Acquired absence of unspecified thumb
    - Z89.02 Acquired absence of other finger(s)
      Z89.021 Acquired absence of right finger(s)
      Z89.022 Acquired absence of left finger(s)
      Z89.029 Acquired absence of unspecified finger(s)
  - Z89.1 Acquired absence of hand and wrist
    - Z89.11 Acquired absence of hand
      Z89.111 Acquired absence of right hand
      Z89.112 Acquired absence of left hand
      Z89.119 Acquired absence of unspecified hand
    - Z89.12 Acquired absence of wrist
      Z89.121 Acquired absence of right wrist
      Z89.122 Acquired absence of left wrist
      Z89.129 Acquired absence of unspecified wrist
  - Z89.2 Acquired absence of upper limb above wrist
    - Z89.20 Acquired absence of upper limb, unspecified l...
      Z89.201 Acquired absence of right upper limb, unspeci...
      Z89.202 Acquired absence of left upper limb, unspecif...
      Z89.209 Acquired absence of unspecified upper limb, u...
    - Z89.21 Acquired absence of upper limb below elbow
      Z89.211 Acquired absence of right upper limb below el...
      Z89.212 Acquired absence of left upper limb below elb...
      Z89.219 Acquired absence of unspecified upper limb be...
    - Z89.22 Acquired absence of upper limb above elbow
      Z89.221 Acquired absence of right upper limb above el...
      Z89.222 Acquired absence of left upper limb above elb...
      Z89.229 Acquired absence of unspecified upper limb ab...
    - Z89.23 Acquired absence of shoulder
      Z89.231 Acquired absence of right shoulder
      Z89.232 Acquired absence of left shoulder
      Z89.239 Acquired absence of unspecified shoulder
  - Z89.4 Acquired absence of toe(s), foot, and ankle
    - Z89.41 Acquired absence of great toe
      Z89.411 Acquired absence of right great toe
      Z89.412 Acquired absence of left great toe
      Z89.419 Acquired absence of unspecified great toe
    - Z89.42 Acquired absence of other toe(s)
      Z89.421 Acquired absence of other right toe(s)
      Z89.422 Acquired absence of other left toe(s)
      Z89.429 Acquired absence of other toe(s), unspecified...
    - Z89.43 Acquired absence of foot
      Z89.431 Acquired absence of right foot
      Z89.432 Acquired absence of left foot
      Z89.439 Acquired absence of unspecified foot
    - Z89.44 Acquired absence of ankle
      Z89.441 Acquired absence of right ankle
      Z89.442 Acquired absence of left ankle
      Z89.449 Acquired absence of unspecified ankle
  - Z89.5 Acquired absence of leg below knee
    - Z89.51 Acquired absence of leg below knee
      Z89.511 Acquired absence of right leg below knee
      Z89.512 Acquired absence of left leg below knee
      Z89.519 Acquired absence of unspecified leg below kne...
    - Z89.52 Acquired absence of knee
      Z89.521 Acquired absence of right knee
      Z89.522 Acquired absence of left knee
      Z89.529 Acquired absence of unspecified knee
  - Z89.6 Acquired absence of leg above knee
    - Z89.61 Acquired absence of leg above knee
      Z89.611 Acquired absence of right leg above knee
      Z89.612 Acquired absence of left leg above knee
      Z89.619 Acquired absence of unspecified leg above kne...
    - Z89.62 Acquired absence of hip
      Z89.621 Acquired absence of right hip joint
      Z89.622 Acquired absence of left hip joint
      Z89.629 Acquired absence of unspecified hip joint
  - Z89.9 Acquired absence of limb, unspecified
Z89.-
)
congenital absence of fingers and toes (
ICD-10-CM Diagnosis Code Q71.3
Congenital absence of hand and finger
Q71.3-
,
ICD-10-CM Diagnosis Code Q72.3
Congenital absence of foot and toe(s)
Q72.3-
)
congenital deformities and malformations of fingers and toes (
ICD-10-CM Diagnosis Code Q66
- Q66 Congenital deformities of feet
  - Q66.0 Congenital talipes equinovarus
    - Q66.00 Congenital talipes equinovarus, unspecified f...
    - Q66.01 …… right foot
    - Q66.02 …… left foot
  - Q66.1 Congenital talipes calcaneovarus
    - Q66.10 Congenital talipes calcaneovarus, unspecified...
    - Q66.11 …… right foot
    - Q66.12 …… left foot
  - Q66.2 Congenital metatarsus (primus) varus
    - Q66.21 Congenital metatarsus primus varus
      Q66.211 Congenital metatarsus primus varus, right foo...
      Q66.212 Congenital metatarsus primus varus, left foot...
      Q66.219 Congenital metatarsus primus varus, unspecifi...
    - Q66.22 Congenital metatarsus adductus
      Q66.221 …… right foot
      Q66.222 …… left foot
      Q66.229 Congenital metatarsus adductus, unspecified f...
  - Q66.3 Other congenital varus deformities of feet
    - Q66.30 Other congenital varus deformities of feet, u...
    - Q66.31 Other congenital varus deformities of feet, r...
    - Q66.32 Other congenital varus deformities of feet, l...
  - Q66.4 Congenital talipes calcaneovalgus
    - Q66.40 Congenital talipes calcaneovalgus, unspecifie...
    - Q66.41 Congenital talipes calcaneovalgus, right foot...
    - Q66.42 …… left foot
  - Q66.5 Congenital pes planus
    - Q66.50 …… unspecified foot
    - Q66.51 …… right foot
    - Q66.52 …… left foot
  - Q66.6 Other congenital valgus deformities of feet
  - Q66.7 Congenital pes cavus
    - Q66.70 …… unspecified foot
    - Q66.71 …… right foot
    - Q66.72 …… left foot
  - Q66.8 Other congenital deformities of feet
    - Q66.80 Congenital vertical talus deformity, unspecif...
    - Q66.81 Congenital vertical talus deformity, right fo...
    - Q66.82 Congenital vertical talus deformity, left foo...
    - Q66.89 Other specified congenital deformities of fee...
  - Q66.9 Congenital deformity of feet, unspecified
    - Q66.90 Congenital deformity of feet, unspecified, un...
    - Q66.91 Congenital deformity of feet, unspecified, ri...
    - Q66.92 Congenital deformity of feet, unspecified, le...
Q66.-
,
ICD-10-CM Diagnosis Code Q68
Other congenital musculoskeletal deformities
Type 1 Excludes
- reduction defects of limb(s) (Q71-Q73)
Type 2 Excludes
- congenital myotonic chondrodystrophy (G71.13)
Q68
-
ICD-10-CM Diagnosis Code Q70
Syndactyly
Q70
,
ICD-10-CM Diagnosis Code Q74
- Q74 Other congenital malformations of limb(s)
  - Q74.0 Other congenital malformations of upper limb(...
  - Q74.1 Congenital malformation of knee
  - Q74.2 Other congenital malformations of lower limb(...
  - Q74.3 Arthrogryposis multiplex congenita
  - Q74.8 Other specified congenital malformations of l...
  - Q74.9 Unspecified congenital malformation of limb(s...
Q74.-
)

The following code(s) above M20 contain annotation back-references

Annotation Back-References

In this context, annotation back-references refer to codes that contain:

Applicable To annotations, or
Code Also annotations, or
Code First annotations, or
Excludes1 annotations, or
Excludes2 annotations, or
Includes annotations, or
Note annotations, or
Use Additional annotations

that may be applicable to M20:

M00-M99
2023 ICD-10-CM Range M00-M99
Diseases of the musculoskeletal system and connective tissue
Note
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Type 2 Excludes
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Diseases of the musculoskeletal system and connective tissue
M20-M25
2023 ICD-10-CM Range M20-M25
Other joint disorders
Type 2 Excludes
- joints of the spine (M40-M54)
Other joint disorders

Code History

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
2022 (effective 10/1/2021): No change
2023 (effective 10/1/2022): No change

Code annotations containing back-references to M20:

Type 2 Excludes: M21

ICD-10-CM Diagnosis Code M21
Other acquired deformities of limbs
Type 1 Excludes
- acquired absence of limb (Z89.-)
- congenital absence of limbs (Q71-Q73)
- congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)
Type 2 Excludes
- acquired deformities of fingers or toes (M20.-)
- coxa plana (M91.2)

ICD-10-CM Codes Adjacent To M20

M19.27 Secondary osteoarthritis, ankle and foot

M19.271 Secondary osteoarthritis, right ankle and foot

M19.272 Secondary osteoarthritis, left ankle and foot

M19.279 Secondary osteoarthritis, unspecified ankle and foot

M19.29 Secondary osteoarthritis, other specified site

M19.9 Osteoarthritis, unspecified site

M19.90 Unspecified osteoarthritis, unspecified site

M19.91 Primary osteoarthritis, unspecified site

M19.92 Post-traumatic osteoarthritis, unspecified site

M19.93 Secondary osteoarthritis, unspecified site

M20 Acquired deformities of fingers and toes

M20.0 Deformity of finger(s)

M20.00 Unspecified deformity of finger(s)

M20.001 Unspecified deformity of right finger(s)

M20.002 Unspecified deformity of left finger(s)

M20.009 Unspecified deformity of unspecified finger(s)

M20.01 Mallet finger

M20.011 …… of right finger(s)

M20.012 …… of left finger(s)

M20.019 …… of unspecified finger(s)

M20.02 Boutonnière deformity

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

2023 ICD-10-CM Diagnosis Code M20

Acquired deformities of fingers and toes

Congenital absence of hand and finger

Congenital absence of foot and toe(s)

Other congenital musculoskeletal deformities

Syndactyly

Diseases of the musculoskeletal system and connective tissue

Other joint disorders

Other acquired deformities of limbs