T84.199A — Other mechanical complication of internal fixation device of unspecified bone of limb, initial encounter
Is T84.199A billable?
Yes, but T84.199A will trip a Medicare edit. T84.199A is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, CMS lists T84.199A under Medicare Code Editor edit 20, “Unspecified code” — meaning a code specifying laterality (right, left or bilateral) exists in the same family. On an inpatient claim this triggers the edit, because CMS holds that there are very limited circumstances in which laterality cannot be documented.
More specific alternatives
- T84.190AOther mechanical complication of internal fixation device of right humerus, initial encounter
- T84.191AOther mechanical complication of internal fixation device of left humerus, initial encounter
- T84.192AOther mechanical complication of internal fixation device of bone of right forearm, initial encounter
- T84.193AOther mechanical complication of internal fixation device of bone of left forearm, initial encounter
- T84.194AOther mechanical complication of internal fixation device of right femur, initial encounter
- T84.195AOther mechanical complication of internal fixation device of left femur, initial encounter
- T84.196AOther mechanical complication of internal fixation device of bone of right lower leg, initial encounter
- T84.197AOther mechanical complication of internal fixation device of bone of left lower leg, initial encounter
T84.199A at a glance
| Code | T84.199A |
|---|---|
| Description | Other mechanical complication of internal fixation device of unspecified bone of limb, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in T84.199A?
In T84.199A, the 7th character A means initial encounter. The 7th character is required for T84.199A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
What Medicare edits apply to T84.199A?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name T84.199A directly.
A code specifying laterality (right, left or bilateral) exists in the same family. CMS holds that there are very limited circumstances in which laterality cannot be documented.
Which MS-DRGs does T84.199A group to?
T84.199A sits in MDC 08 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 559Aftercare, Musculoskeletal System and Connective Tissue with MCCmedical
- 560Aftercare, Musculoskeletal System and Connective Tissue with CCmedical
- 561Aftercare, Musculoskeletal System and Connective Tissue without CC/MCCmedical
As a secondary diagnosis, T84.199A is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is T84.199A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T84.199, the nearest indexed parent of T84.199A. Use them to find the family, then select the specific code.
- Complication › fixation device, internal › mechanical › specified type NEC › limb (s) (from) (of)
Use additional code — inherited from Chapter 19
Report an additional code alongside T84.199A to fully describe the condition. T84.199A is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T80-T88
Report an additional code alongside T84.199A to fully describe the condition. T84.199A is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T84.199A, but a patient may have both at the same time. When documentation supports it, T84.199A and the excluded code may both be reported.
Excludes2 — not included here — inherited from T80-T88
The conditions below are not part of T84.199A, but a patient may have both at the same time. When documentation supports it, T84.199A and the excluded code may both be reported.
- any encounters with medical care for postprocedural conditions in which no complications are present, such as:
- artificial opening status (Z93.-)
- closure of external stoma (Z43.-)
- fitting and adjustment of external prosthetic device (Z44.-)
- burns and corrosions from local applications and irradiation (T20-T32)
- complications of surgical procedures during pregnancy, childbirth and the puerperium (O00-O9A)
- mechanical complication of respirator [ventilator] (J95.850)
- poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4 or 6)
- postprocedural fever (R50.82)
- specified complications classified elsewhere, such as:
- cerebrospinal fluid leak from spinal puncture (G97.0)
- colostomy malfunction (K94.0-)
- disorders of fluid and electrolyte imbalance (E86-E87)
- functional disturbances following cardiac surgery (I97.0-I97.1)
- intraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-)
- ostomy complications (J95.0-, K94.-, N99.5-)
- postgastric surgery syndromes (K91.1)
- postlaminectomy syndrome NEC (M96.1)
- postmastectomy lymphedema syndrome (I97.2)
- postsurgical blind-loop syndrome (K91.2)
- ventilator associated pneumonia (J95.851)
Excludes2 — not included here — inherited from T84
The conditions below are not part of T84.199A, but a patient may have both at the same time. When documentation supports it, T84.199A and the excluded code may both be reported.
Excludes2 — not included here — inherited from T84.1
The conditions below are not part of T84.199A, but a patient may have both at the same time. When documentation supports it, T84.199A and the excluded code may both be reported.
- mechanical complication of internal fixation device of bones of feet (T84.2-)
- mechanical complication of internal fixation device of bones of fingers (T84.2-)
- mechanical complication of internal fixation device of bones of hands (T84.2-)
- mechanical complication of internal fixation device of bones of toes (T84.2-)
How long has T84.199A existed?
T84.199A has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.