All ICD10 Codes

M66

Non-Billable
ChapterM00–M99
Rankcategory
Official Description

Spontaneous rupture of synovium and tendon

Use a more specific code (2 billable, 4 non-billable)
M66.0Rupture of popliteal cystM66.1Rupture of synoviumhas subcodesM66.2Spontaneous rupture of extensor tendonshas subcodesM66.3Spontaneous rupture of flexor tendonshas subcodesM66.8Spontaneous rupture of other tendonshas subcodesM66.9Spontaneous rupture of unspecified tendon
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).

CH13 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • 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)

Instructional Notes

Includes
  • rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength
Excludes2(Not included here. Code separately if applicable.)
  • rotator cuff syndrome (M75.1-)
  • rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region

Clinical Hierarchy

BillableHas subcodes
CH13Diseases of the musculoskeletal system and connective tissue (M00-M99)
M65-M67Disorders of synovium and tendon (M65-M67)
M66Spontaneous rupture of synovium and tendonNot billable
M66.0Rupture of popliteal cystBillable
M66.1Rupture of synoviumSubcodes
M66.2Spontaneous rupture of extensor tendonsSubcodes
M66.3Spontaneous rupture of flexor tendonsSubcodes
M66.8Spontaneous rupture of other tendonsSubcodes
M66.9Spontaneous rupture of unspecified tendonBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to M66:

chapterCH13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Spontaneous rupture of synovium and tendon.

Search PCS Codes