ICDcodes.org
FY2027

M66.171 — Rupture of synovium, right ankle

Billable

Is M66.171 billable?

Yes — M66.171 is billable for FY2027. M66.171 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. M66.171 may be submitted for encounters from October 1, 2026 through September 30, 2027.

M66.171 at a glance

CodeM66.171
DescriptionRupture of synovium, right ankle
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does M66.171 group to?

M66.171 sits in MDC 08 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 557Tendonitis, Myositis and Bursitis with MCCmedical
  • 558Tendonitis, Myositis and Bursitis without MCCmedical

How is M66.171 listed in the Alphabetic Index?

The Alphabetic Index lists these routes under M66.17, the nearest indexed parent of M66.171. Use them to find the family, then select the specific code.

  • Rupture, ruptured › synovium › ankle
  • Rupture, ruptured › synovium › foot
  • Rupture, ruptured › synovium › toe

Excludes2 — not included here — inherited from Chapter 13

The conditions below are not part of M66.171, but a patient may have both at the same time. When documentation supports it, M66.171 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 M66

The conditions below are not part of M66.171, but a patient may have both at the same time. When documentation supports it, M66.171 and the excluded code may both be reported.

  • rotator cuff syndrome (M75.1-)
  • rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region

Excludes2 — not included here — inherited from M66.1

The conditions below are not part of M66.171, but a patient may have both at the same time. When documentation supports it, M66.171 and the excluded code may both be reported.

  • rupture of popliteal cyst (M66.0)

How long has M66.171 existed?

M66.171 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 M66.17 family? (8)