T37.0X5A is the authoritative medical code for Adverse effect of sulfonamides, initial encounter. This classification is used in medical billing and clinical recording to specify the clinical criteria for adverse effect of sulfonamides, initial encounter (ICD-10-CM T37.0X5A), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Adverse effect of sulfonamides, initial encounter is a billable ICD-10-CM diagnosis code T37.0X5A. 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): anti-infectives topically used for ear, nose and throat T49.6-; anti-infectives topically used for eye T49.5-; locally applied anti-infectives NEC T49.0-; 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 T37.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T37.0X5A 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.
- anti-infectives topically used for ear, nose and throat T49.6-
- anti-infectives topically used for eye T49.5-
- locally applied anti-infectives NEC T49.0-
- 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
Does T37.0X5A require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T37.
What can't be coded together with T37.0X5A?
Per official ICD-10-CM Excludes1 instructions, T37.0X5A must not be reported together with: anti-infectives topically used for ear, nose and throat (T49.6-); anti-infectives topically used for eye (T49.5-); locally applied anti-infectives NEC (T49.0-); toxic reaction to local anesthesia in pregnancy (O29.3-).
Can T37.0X5A be reported alongside related conditions?
Per official ICD-10-CM Excludes2 instructions, T37.0X5A 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 T37.0X5A 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).
Is an additional code needed with T37.0X5A?
Use additional code(s) to specify: 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-).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to T37.0X5A in its code family, with their registry titles.
- T37 — Poisoning by, adverse effect of and underdosing of other systemic anti-infectives and antiparasitics
- T37.0 — Poisoning by, adverse effect of and underdosing of sulfonamides
- T37.0X — Poisoning by, adverse effect of and underdosing of sulfonamides
- T37.0X1 — Poisoning by sulfonamides, accidental (unintentional)
- T37.0X1A — Poisoning by sulfonamides, accidental (unintentional), initial encounter
- T37.0X1D — Poisoning by sulfonamides, accidental (unintentional), subsequent encounter
- T37.0X1S — Poisoning by sulfonamides, accidental (unintentional), sequela
- T37.0X2 — Poisoning by sulfonamides, intentional self-harm
- T37.0X2A — Poisoning by sulfonamides, intentional self-harm, initial encounter
- T37.0X2D — Poisoning by sulfonamides, intentional self-harm, subsequent encounter
View all 40 codes in the T37 family
Associated Substances (62)
Substances from the official ICD-10-CM Table of Drugs and Chemicals that map to this code.
- Acedapsone
- Acesulfamethoxypyridazine
- Acetylsulfamethoxypyridazine
- Azosulfamide
- Azulfidine
- Diaphenylsulfone
- Disulfanilamide
- Neoprontosil
- Phthalylsulfathiazole
- Prontosil
- Salazosulfapyridine
- Salicylazosulfapyridine
- Succinylsulfathiazole
- Sulfachlorpyridazine
- Sulfacitine
- Sulfadiasulfone sodium
- Sulfadiazine
- Sulfadimethoxine
- Sulfadimidine
- Sulfadoxine
- Sulfaethidole
- Sulfafurazole
- Sulfaguanidine
- Sulfalene
- Sulfaloxate
- Sulfaloxic acid
- Sulfamerazine
- Sulfameter
- Sulfamethazine
- Sulfamethizole
- Sulfamethoxazole
- Sulfamethoxydiazine
- Sulfamethoxypyridazine
- Sulfamethylthiazole
- Sulfametoxydiazine
- Sulfamonomethoxine
- Sulfamoxole
- Sulfanilamide
- Sulfanilylguanidine
- Sulfaperin
- Sulfaphenazole
- Sulfaphenylthiazole
- Sulfaproxyline
- Sulfapyridine
- Sulfapyrimidine
- Sulfasalazine
- Sulfasuxidine
- Sulfasymazine
- Sulfathiazole
- Sulfisomidine
- Sulfisoxazole
- Sulfonamide NEC
- Sulphadiazine
- Sulphadimethoxine
- Sulphadimidine
- Sulphafurazole
- Sulphamethizole
- Sulphamethoxazole
- Sulphaphenazole
- Sulphapyridine
- Sulphasalazine
- Trisulfapyrimidines