ICDcodes.org
FY2027

M21.7 — Unequal limb length (acquired)

Not billable

Is M21.7 billable?

No — M21.7 is a non-billable header code. M21.7 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 17 billable codes beneath M21.7.

Billable codes under this header

M21.7 at a glance

CodeM21.7
DescriptionUnequal limb length (acquired)
BillableNo — header code
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Note

  • The site used should correspond to the shorter limb

Excludes1 — never code together — inherited from M21

The conditions below can never be reported together with M21.7 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • 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 — inherited from Chapter 13

The conditions below are not part of M21.7, but a patient may have both at the same time. When documentation supports it, M21.7 and the excluded code may both be reported.

  • 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)

Excludes2 — not included here — inherited from M20-M25

The conditions below are not part of M21.7, but a patient may have both at the same time. When documentation supports it, M21.7 and the excluded code may both be reported.

  • joints of the spine (M40-M54)

Excludes2 — not included here — inherited from M21

The conditions below are not part of M21.7, but a patient may have both at the same time. When documentation supports it, M21.7 and the excluded code may both be reported.

  • acquired deformities of fingers or toes (M20.-)
  • coxa plana (M91.2)

What codes fall under M21.7? (5)

How long has M21.7 existed?

M21.7 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

What other codes are in the M21 family? (9)