S66.021S is the authoritative medical code for Laceration of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, sequela. This classification is used in medical billing and clinical recording to specify the clinical criteria for laceration of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, sequela (ICD-10-CM S66.021S), 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
Laceration of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, sequela is a billable ICD-10-CM diagnosis code S66.021S. Excludes2 (not included here): sprain of joints and ligaments of wrist and hand S63.-; burns and corrosions T20-T32; frostbite T33-T34; insect bite or sting, venomous T63.4. Code also: any associated open wound S61.-. 7th character: The appropriate 7th character is to be added to each code from category S66.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for S66.021S 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.
- sprain of joints and ligaments of wrist and hand S63.-
- burns and corrosions T20-T32
- frostbite T33-T34
- insect bite or sting, venomous T63.4
Code Also
Additional codes that may be required to fully describe the encounter.
- any associated open wound S61.-
Frequently Asked Questions (FAQ) & Clinical Guidance
Does S66.021S require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category S66.
Can S66.021S be reported alongside related conditions?
Per official ICD-10-CM Excludes2 instructions, S66.021S and the following are not considered part of each other and may both be reported when both conditions are present: sprain of joints and ligaments of wrist and hand (S63.-); burns and corrosions (T20-T32); frostbite (T33-T34); insect bite or sting, venomous (T63.4).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to S66.021S in its code family, with their registry titles.
- S66 — Injury of muscle, fascia and tendon at wrist and hand level
- S66.0 — Injury of long flexor muscle, fascia and tendon of thumb at wrist and hand level
- S66.00 — Unspecified injury of long flexor muscle, fascia and tendon of thumb at wrist and hand level
- S66.001 — Unspecified injury of long flexor muscle, fascia and tendon of right thumb at wrist and hand level
- S66.001A — Unspecified injury of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter
- S66.001D — Unspecified injury of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter
- S66.001S — Unspecified injury of long flexor muscle, fascia and tendon of right thumb at wrist and hand level, sequela
- S66.002 — Unspecified injury of long flexor muscle, fascia and tendon of left thumb at wrist and hand level
- S66.002A — Unspecified injury of long flexor muscle, fascia and tendon of left thumb at wrist and hand level, initial encounter
- S66.002D — Unspecified injury of long flexor muscle, fascia and tendon of left thumb at wrist and hand level, subsequent encounter
View all 40 codes in the S66 family