ICDcodes.org
FY2027

M23.8 — Other internal derangements of knee

Not billable

Is M23.8 billable?

No — M23.8 is a non-billable header code. M23.8 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 3 billable codes beneath M23.8.

M23.8 at a glance

CodeM23.8
DescriptionOther internal derangements of knee
BillableNo — header code
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Inclusion terms

Alternative wording in documentation that is classified to M23.8.

  • Laxity of ligament of knee
  • Snapping knee

Excludes1 — never code together — inherited from M23

The conditions below can never be reported together with M23.8 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

Excludes2 — not included here — inherited from Chapter 13

The conditions below are not part of M23.8, but a patient may have both at the same time. When documentation supports it, M23.8 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 M23.8, but a patient may have both at the same time. When documentation supports it, M23.8 and the excluded code may both be reported.

  • joints of the spine (M40-M54)

Excludes2 — not included here — inherited from M23

The conditions below are not part of M23.8, but a patient may have both at the same time. When documentation supports it, M23.8 and the excluded code may both be reported.

  • current injury - see injury of knee and lower leg (S80-S89)
  • recurrent dislocation or subluxation of joints (M24.4)
  • recurrent dislocation or subluxation of patella (M22.0-M22.1)

What codes fall under M23.8? (1)

How long has M23.8 existed?

M23.8 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 M23 family? (7)