ICD-10-CM › M00-M99 › M20-M25 › M21.7 Unequal limb length (acquired) › M21.76
Unequal limb length (acquired), tibia and fibula
Not billableICD-10-CM diagnosis code.
This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.
Submit one of these 5 more specific codes instead:
What has happened to this code
Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2012 Added to the draft code set draft Unequal limb length (acquired), tibia and fibula
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from M21 Other acquired deformities of limbs
Excludes1 - never coded here
- acquired absence of limb (Z89.-)
- congenital absence of limbs (Q71-Q73)
- congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)
Excludes2 - not included here
- acquired deformities of fingers or toes (M20.-)
- coxa plana (M91.2)
Inherited from the M20-M25 section Other joint disorders (M20-M25)
Excludes2 - not included here
- joints of the spine (M40-M54)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Unequal length
- Bruck's disease
- Inequality, leg
- Lengthening, leg
- Deformity > rotation
- Unequal length > leg
- Discrepancy > leg length
- Inequality, leg > lower leg
- Short, shortening, shortness > arm
- Short, shortening, shortness > hip
- Short, shortening, shortness > leg
- Short, shortening, shortness > femur
- Short, shortening, shortness > thigh
- Short, shortening, shortness > radius
- Short, shortening, shortness > lower limb
- Short, shortening, shortness > arm > forearm
- Short, shortening, shortness > leg > lower leg
- Deformity > limb > unequal length > short site is > tibia
- Deformity > limb > unequal length > short site is > fibula
Codes in the same group
| Code | Description | Status |
|---|---|---|
| M21.70 | Unequal limb length (acquired), unspecified site | Valid |
| M21.72 | Unequal limb length (acquired), humerus | Not billable |
| M21.73 | Unequal limb length (acquired), ulna and radius | Not billable |
| M21.75 | Unequal limb length (acquired), femur | Not billable |