T85.635A — Leakage of other nervous system device, implant or graft, initial encounter
Is T85.635A billable?
Yes — T85.635A is billable for FY2027. T85.635A is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T85.635A may be submitted for encounters from October 1, 2026 through September 30, 2027.
T85.635A at a glance
| Code | T85.635A |
|---|---|
| Description | Leakage of other nervous system device, implant or graft, 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 T85.635A?
In T85.635A, the 7th character A means initial encounter. The 7th character is required for T85.635A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T85.635A group to?
T85.635A sits in MDC 01 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.
- 091Other Disorders of Nervous System with MCCmedical
- 092Other Disorders of Nervous System with CCmedical
- 093Other Disorders of Nervous System without CC/MCCmedical
As a secondary diagnosis, T85.635A is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is T85.635A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T85.635, the nearest indexed parent of T85.635A. Use them to find the family, then select the specific code.
- Complication › intrathecal infusion pump › mechanical › leakage (s) (from) (of)
- Complication › nervous system › device, implant or graft › specified NEC › mechanical › leakage (s) (from) (of)
Inclusion terms
Alternative wording in documentation that is classified to T85.635A.
- Leakage of intrathecal infusion pump
Use additional code — inherited from Chapter 19
Report an additional code alongside T85.635A to fully describe the condition. T85.635A 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 T85.635A to fully describe the condition. T85.635A is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T85.635A, but a patient may have both at the same time. When documentation supports it, T85.635A and the excluded code may both be reported.
Excludes2 — not included here — inherited from T80-T88
The conditions below are not part of T85.635A, but a patient may have both at the same time. When documentation supports it, T85.635A 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 T85
The conditions below are not part of T85.635A, but a patient may have both at the same time. When documentation supports it, T85.635A and the excluded code may both be reported.
- failure and rejection of transplanted organs and tissue (T86.-)
How long has T85.635A existed?
T85.635A first appears in FY2018 (FY2017 is not available, so it may have appeared then).
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.