M66.821 is the authoritative medical code for Spontaneous rupture of other tendons, right upper arm. This classification is used in medical billing and clinical recording to specify the clinical criteria for spontaneous rupture of other tendons, right upper arm (ICD-10-CM M66.821), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Spontaneous rupture of other tendons, right upper arm is a billable ICD-10-CM diagnosis code M66.821. 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.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for M66.821 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- rotator cuff syndrome M75.1-
- rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region
Frequently Asked Questions (FAQ) & Clinical Guidance
Can M66.821 be reported alongside related conditions?
Per official ICD-10-CM Excludes2 instructions, M66.821 and the following are not considered part of each other and may both be reported when both conditions are present: rotator cuff syndrome (M75.1-); rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region.
Nearest Codes in This Family
Official ICD-10-CM classifications closest to M66.821 in its code family, with their registry titles.
- M66 — Spontaneous rupture of synovium and tendon
- M66.0 — Rupture of popliteal cyst
- M66.1 — Rupture of synovium
- M66.10 — Rupture of synovium, unspecified joint
- M66.11 — Rupture of synovium, shoulder
- M66.111 — Rupture of synovium, right shoulder
- M66.112 — Rupture of synovium, left shoulder
- M66.119 — Rupture of synovium, unspecified shoulder
- M66.12 — Rupture of synovium, elbow
- M66.121 — Rupture of synovium, right elbow
View all 40 codes in the M66 family