T36.2X6 is the authoritative medical code for Underdosing of chloramphenicol group. This classification is used in medical billing and clinical recording to specify the clinical criteria for underdosing of chloramphenicol group (ICD-10-CM T36.2X6), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Underdosing of chloramphenicol group is a non-billable ICD-10-CM category code T36.2X6. A more specific billable subcode must be selected for claims submission. Includes: adverse effect of correct substance properly administered; poisoning by overdose of substance; poisoning by wrong substance given or taken in error; underdosing by (inadvertently) deliberately taking less substance than prescribed or instructed. Excludes1 (not coded here): 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; toxic reaction to local anesthesia in pregnancy O29.3-. Excludes2 (not included here): abuse and dependence of psychoactive substances F10-F19; abuse of non-dependence-producing substances F55.-; immunodeficiency due to drugs D84.821; drug reaction and poisoning affecting newborn P00-P96; pathological drug intoxication inebriation F10-F19. Code first: , for adverse effects, the nature of the adverse effect, such as:; adverse effect NOS T88.7; aspirin gastritis K29.-; blood disorders D56-D76; contact dermatitis L23-L25; dermatitis due to substances taken internally L27.-; nephropathy N14.0-N14.2. Use additional code: code(s) to specify:; manifestations of poisoning; underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9); underdosing of medication regimen (Z91.12-, Z91.13-). 7th character: The appropriate 7th character is to be added to each code from category T36.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T36.2X6 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- adverse effect of correct substance properly administered
- poisoning by overdose of substance
- poisoning by wrong substance given or taken in error
- underdosing by (inadvertently) deliberately taking less substance than prescribed or instructed
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- 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
- toxic reaction to local anesthesia in pregnancy O29.3-
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- abuse and dependence of psychoactive substances F10-F19
- abuse of non-dependence-producing substances F55.-
- immunodeficiency due to drugs D84.821
- drug reaction and poisoning affecting newborn P00-P96
- pathological drug intoxication inebriation F10-F19
Code First
Underlying conditions that must be sequenced before this code.
- , for adverse effects, the nature of the adverse effect, such as:
- adverse effect NOS T88.7
- aspirin gastritis K29.-
- blood disorders D56-D76
- contact dermatitis L23-L25
- dermatitis due to substances taken internally L27.-
- nephropathy N14.0-N14.2
Use Additional Code
Supplementary codes the tabular list directs you to add.
- code(s) to specify:
- manifestations of poisoning
- underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
- underdosing of medication regimen (Z91.12-, Z91.13-)
Frequently Asked Questions (FAQ) & Clinical Guidance
Can T36.2X6 be billed directly?
No. T36.2X6 (Underdosing of chloramphenicol group) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Does T36.2X6 require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T36.
What can't be coded together with T36.2X6?
Per official ICD-10-CM Excludes1 instructions, T36.2X6 must not be reported together with: 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).
Can T36.2X6 be reported alongside related conditions?
Per official ICD-10-CM Excludes2 instructions, T36.2X6 and the following are not considered part of each other and may both be reported when both conditions are present: abuse and dependence of psychoactive substances (F10-F19); abuse of non-dependence-producing substances (F55.-); immunodeficiency due to drugs (D84.821); drug reaction and poisoning affecting newborn (P00-P96).
Does T36.2X6 need to be sequenced after another code?
Yes. Code first: , for adverse effects, the nature of the adverse effect, such as:; adverse effect NOS (T88.7); aspirin gastritis (K29.-); blood disorders (D56-D76).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to T36.2X6 in its code family, with their registry titles.
- T36.2X6A — Underdosing of chloramphenicol group, initial encounter
- T36.2X6D — Underdosing of chloramphenicol group, subsequent encounter
- T36.2X6S — Underdosing of chloramphenicol group, sequela
Associated Substances (5)
Substances from the official ICD-10-CM Table of Drugs and Chemicals that map to this code.
- Chloramphenicol
- Chloromycetin
- Cloponone
- Cloramfenicol
- Thiamphenicol