S56.311A is the authoritative medical code for Strain of extensor or abductor muscles, fascia and tendons of right thumb at forearm level, initial encounter. This classification is used in medical billing and clinical recording to specify the clinical criteria for strain of extensor or abductor muscles, fascia and tendons of right thumb at forearm level, initial encounter (ICD-10-CM S56.311A), 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
Strain of extensor or abductor muscles, fascia and tendons of right thumb at forearm level, initial encounter is a billable ICD-10-CM diagnosis code S56.311A. Excludes2 (not included here): injury of muscle, fascia and tendon at or below wrist S66.-; sprain of joints and ligaments of elbow S53.4-; burns and corrosions T20-T32; frostbite T33-T34; injuries of wrist and hand S60-S69; insect bite or sting, venomous T63.4. Code also: any associated open wound S51.-. 7th character: The appropriate 7th character is to be added to each code from category S56.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for S56.311A in the official ICD-10-CM tabular list.
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- injury of muscle, fascia and tendon at or below wrist S66.-
- sprain of joints and ligaments of elbow S53.4-
- burns and corrosions T20-T32
- frostbite T33-T34
- injuries of wrist and hand S60-S69
- insect bite or sting, venomous T63.4
Code Also
Additional codes that may be required to fully describe the encounter.
- any associated open wound S51.-
Frequently Asked Questions (FAQ) & Clinical Guidance
Does S56.311A require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category S56.
Can S56.311A be reported alongside related conditions?
Per official ICD-10-CM Excludes2 instructions, S56.311A and the following are not considered part of each other and may both be reported when both conditions are present: injury of muscle, fascia and tendon at or below wrist (S66.-); sprain of joints and ligaments of elbow (S53.4-); burns and corrosions (T20-T32); frostbite (T33-T34).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to S56.311A in its code family, with their registry titles.
- S56 — Injury of muscle, fascia and tendon at forearm level
- S56.0 — Injury of flexor muscle, fascia and tendon of thumb at forearm level
- S56.00 — Unspecified injury of flexor muscle, fascia and tendon of thumb at forearm level
- S56.001 — Unspecified injury of flexor muscle, fascia and tendon of right thumb at forearm level
- S56.001A — Unspecified injury of flexor muscle, fascia and tendon of right thumb at forearm level, initial encounter
- S56.001D — Unspecified injury of flexor muscle, fascia and tendon of right thumb at forearm level, subsequent encounter
- S56.001S — Unspecified injury of flexor muscle, fascia and tendon of right thumb at forearm level, sequela
- S56.002 — Unspecified injury of flexor muscle, fascia and tendon of left thumb at forearm level
- S56.002A — Unspecified injury of flexor muscle, fascia and tendon of left thumb at forearm level, initial encounter
- S56.002D — Unspecified injury of flexor muscle, fascia and tendon of left thumb at forearm level, subsequent encounter
View all 40 codes in the S56 family