M66.0 – Rupture of popliteal cyst

ICD-10-CM 2027 diagnosis code · Disorders of synovium and tendon

Billable code

ICD-10-CM code M66.0

Code: M66.0 (claims format: M660)
Description: Rupture of popliteal cyst
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M65-M67 Disorders of synovium and tendon
Parent codes: M66

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

M66 – Spontaneous rupture of synovium and tendon

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):

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

Index terms for M66.0

Entries in the ICD-10-CM alphabetic index that lead to this code:

Cyst, Baker's, ruptured

Related codes in M66

Frequently asked questions

What is ICD-10 code M66.0?

M66.0 is the ICD-10-CM code for rupture of popliteal cyst, in the block M65-M67 (Disorders of synovium and tendon).

Is M66.0 a billable code?

Yes. M66.0 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does M66.0 belong to?

It belongs to category M66 – Spontaneous rupture of synovium and tendon.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.