2026 ICD-10-CM Diagnosis Code T85.735AInfection and inflammatory reaction due to cranial or spinal infusion catheter, initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T85

ICD-10-CM T85.735A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T85.735A is a billable ICD-10-CM diagnosis code for infection and inflammatory reaction due to cranial or spinal infusion catheter, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of other surgical or medical care, injury, initial encounter.

Code Identity

ICD-10-CM Code
T85.735A
Billable Status
Yes — Valid for Submission
Code Describes
Infection and inflammatory reaction due to cranial or spinal infusion catheter, initial encounter
Short Description
I/I react d/t cranial or spinal infusion catheter, init
Parent Code
T85.735
Infection and inflammatory reaction due to cranial or spinal infusion catheter

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT80-T88Complications of surgical and medical care, not elsewhere classified
CategoryT85Complications of other internal prosthetic devices, implants and grafts
This CodeT85.735AInfection and inflammatory reaction due to cranial or spinal infusion catheter, initial encounter

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Complications of other internal prosthetic devices, implants and grafts (T85). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ037
Complication of other surgical or medical care, injury, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert T85.735A to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
996.63 React-nerv sys dev/graft
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement T85.735A replaces the following previously assigned code(s):

  • T85.79XA - Infect/inflm reaction due to oth int prosth dev/grft, init
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T85.735AOverview

Is T85.735A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report infection and inflammatory reaction due to cranial or spinal infusion catheter, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T85.735A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for infection and inflammatory reaction due to cranial or spinal infusion catheter, such as an emergency visit or first evaluation.

What is the ICD-9 equivalent of T85.735A?

Under the General Equivalence Mappings, infection and inflammatory reaction due to cranial or spinal infusion catheter, initial encounter converts to ICD-9-CM 996.63 (react-nerv sys dev/graft). The mapping is approximate, so confirm the match fits the documentation.