ICD-10-CM 2027 diagnosis code

T36.5X6Underdosing of aminoglycosides

Not billable — use a more specific codeRequires 7th character

T36.5X6 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About T36.5X6

T36.5X6 is the ICD-10-CM diagnosis code for underdosing of aminoglycosides. It belongs to category T36 (poisoning by, adverse effect of and underdosing of systemic antibiotics), block T36-T50 (poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within T36.5X (poisoning by, adverse effect of and underdosing of aminoglycosides), T36.5X6 is specifically for underdosing of aminoglycosides. Related codes cover poisoning by aminoglycosides, accidental (unintentional) (T36.5X1), poisoning by aminoglycosides, intentional self-harm (T36.5X2), poisoning by aminoglycosides, assault (T36.5X3), poisoning by aminoglycosides, undetermined (T36.5X4) and adverse effect of aminoglycosides (T36.5X5).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

The appropriate 7th character is to be added to each code from category T36

Ainitial encounterT36.5X6A
Dsubsequent encounterT36.5X6D
SsequelaT36.5X6S

Notes that apply from higher levels

Instructions written at a parent level also apply to T36.5X6.

› From T36 Poisoning by, adverse effect of and underdosing of systemic antibiotics

Excludes1

antineoplastic antibiotics (T45.1-)
locally applied antibiotic NEC (T49.0)
topically used antibiotic for ear, nose and throat (T49.6)
topically used antibiotic for eye (T49.5)

Broader instructions also apply from T36-T50 Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Table of Drugs & Neoplasms entries

Amikacin — Underdosing
Antibiotic NEC › aminoglycoside — Underdosing
Antibiotic NEC › antimycobacterial — Underdosing
Anti-infective NEC › antimycobacterial NEC › antibiotics — Underdosing
Antimycobacterial drug NEC › antibiotics — Underdosing
Antituberculars › antibiotics — Underdosing
Astromicin — Underdosing
Bekanamycin — Underdosing
Dibekacin — Underdosing
Dihydrostreptomycin — Underdosing
Framycetin — Underdosing
Garamycin — Underdosing
Gentamicin — Underdosing
Isepamicin — Underdosing
Kanamycin — Underdosing
Kantrex — Underdosing
Micronomicin — Underdosing
Mycifradin — Underdosing
Neomycin (derivatives) — Underdosing
Netilmicin — Underdosing
Novobiocin — Underdosing
Paromomycin — Underdosing
Ribostamycin — Underdosing
Sisomicin — Underdosing
Spectinomycin — Underdosing
Streptoduocin — Underdosing
Streptomycin (derivative) — Underdosing
Streptonivicin — Underdosing
Streptovarycin — Underdosing
Tobramycin — Underdosing

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about T36.5X6

Is T36.5X6 billable?: No. T36.5X6 is a header code. Report one of its more specific subcodes instead.