T83.518A vs T83.518D

T83.518A (Infection and inflammatory reaction due to other urinary catheter, initial encounter) compared with T83.518D (Infection and inflammatory reaction due to other urinary catheter, subsequent encounter), from the official CMS tabular data. T83.518A and T83.518D code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

T83.518A

Initial encounter

Infection and inflammatory reaction due to other urinary catheter, initial encounter

↔

T83.518D

Subsequent encounter

Infection and inflammatory reaction due to other urinary catheter, subsequent encounter

Same underlying diagnosis, different encounter phase.

The 7th character records the phase of care for the encounter being coded, so a single encounter takes one of these characters, not several. Review whether both phases belong on the same episode of care.

Source: ICD-10-CM Official Guidelines, Section I.C.19.a

Can these codes be reported together?

Same injury, other encounter phase. T83.518A and T83.518D code the same injury at a different phase of treatment, set by the 7th character.

The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.

Side by side

	T83.518AInfection and inflammatory reaction due to other urinary catheter, initial encounter	T83.518DInfection and inflammatory reaction due to other urinary catheter, subsequent encounter
Billing status	Billable	Billable
Classification	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
Definition	Infection and inflammatory reaction due to other urinary catheter, initial encounter is a billable ICD-10-CM diagnosis code (T83.518A).	Infection and inflammatory reaction due to other urinary catheter, subsequent encounter is a billable ICD-10-CM diagnosis code (T83.518D).
7th character	The appropriate 7th character is to be added to each code from category T83	The appropriate 7th character is to be added to each code from category T83
Includes	Infection and inflammatory reaction due to Hopkins catheter Infection and inflammatory reaction due to ileostomy catheter Infection and inflammatory reaction due to urostomy catheter	Infection and inflammatory reaction due to Hopkins catheter Infection and inflammatory reaction due to ileostomy catheter Infection and inflammatory reaction due to urostomy catheter
Use additional code	code to identify infection code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) code(s) to identify the specified condition resulting from the complication	code to identify infection code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) code(s) to identify the specified condition resulting from the complication

Edit this comparison Check a whole claim

Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources