2021

  1. ICD-10-CM Codes
    2. ›
  2. S00-T88 Injury, poisoning and certain other consequences of external causes
    3. ›
  3. S60-S69 Injuries to the wrist, hand and fingers
    4. ›
  4. S66- Injury of muscle, fascia and tendon at wrist and hand level
    5. ›
  5. 2021 ICD-10-CM Diagnosis Code S66.399

2021 ICD-10-CM Diagnosis Code S66.399

Other injury of extensor muscle, fascia and tendon of unspecified finger at wrist and hand level

    2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • S66.399 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • Short description: Inj extensor musc/fasc/tend unsp finger at wrs/hnd lv
  • The 2021 edition of ICD-10-CM S66.399 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of S66.399 - other international versions of ICD-10 S66.399 may differ.
The following code(s) above S66.399 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to S66.399:
  • S00-T88
    2021 ICD-10-CM Range S00-T88

    Injury, poisoning and certain other consequences of external causes

    Note
    • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
    Type 1 Excludes
    Use Additional
    • code to identify any retained foreign body, if applicable (Z18.-)
    Injury, poisoning and certain other consequences of external causes
  • S60-S69
    2021 ICD-10-CM Range S60-S69

    Injuries to the wrist, hand and fingers

    Type 2 Excludes
    Injuries to the wrist, hand and fingers
  • S66
    ICD-10-CM Diagnosis Code S66

    Injury of muscle, fascia and tendon at wrist and hand level

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Code Also
    • any associated open wound (S61.-)
    Type 2 Excludes
    • sprain of joints and ligaments of wrist and hand (S63.-)
    Injury of muscle, fascia and tendon at wrist and hand level
  • S66.3
    ICD-10-CM Diagnosis Code S66.3

    Injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level (S66.2-)
    Injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to S66.399:
  • Injury T14.90
    - see also specified injury type
    ICD-10-CM Diagnosis Code T14.90

    Injury, unspecified

      2016 2017 2018 - Converted to Parent Code 2019 2020 2021 Non-Billable/Non-Specific Code
    Applicable To
    • Injury NOS
    • muscle (and fascia) (and tendon)
      • finger
        • extensor (forearm level) S56.40-
          ICD-10-CM Diagnosis Code S56.40-

          Unspecified injury of extensor muscle, fascia and tendon of other and unspecified finger at forearm level

            2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
          • hand level S66.309
            ICD-10-CM Diagnosis Code S66.309

            Unspecified injury of extensor muscle, fascia and tendon of unspecified finger at wrist and hand level

              2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
            • specified type NEC S66.399

ICD-10-CM Codes Adjacent To S66.399
S66.396D …… subsequent encounter
S66.396S …… sequela
S66.397 Other injury of extensor muscle, fascia and tendon of left little finger at wrist and hand level
S66.397A …… initial encounter
S66.397D …… subsequent encounter
S66.397S …… sequela
S66.398 Other injury of extensor muscle, fascia and tendon of other finger at wrist and hand level
S66.398A …… initial encounter
S66.398D …… subsequent encounter
S66.398S …… sequela
S66.399 Other injury of extensor muscle, fascia and tendon of unspecified finger at wrist and hand level
S66.399A …… initial encounter
S66.399D …… subsequent encounter
S66.399S …… sequela
S66.4 Injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
S66.40 Unspecified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
S66.401 Unspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level
S66.401A …… initial encounter
S66.401D …… subsequent encounter
S66.401S …… sequela
S66.402 Unspecified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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