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ICD-10/T37.1X1A

T37.1X1A ICD-10-CM Code: Poisoning by antimycobacterial drugs, accidental (unintentional), initial encounter

T37.1X1A is the authoritative medical code for Poisoning by antimycobacterial drugs, accidental (unintentional), initial encounter. This classification is used in medical billing and clinical recording to specify the clinical criteria for poisoning by antimycobacterial drugs, accidental (unintentional), initial encounter (ICD-10-CM T37.1X1A), ensuring healthcare documentation aligns with current federal coding standards.

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

  • MS-DRG 917 — POISONING AND TOXIC EFFECTS OF DRUGS WITH MCC (MDC 21)
  • MS-DRG 918 — POISONING AND TOXIC EFFECTS OF DRUGS WITHOUT MCC (MDC 21)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Poisoning by antimycobacterial drugs, accidental (unintentional), initial encounter is a billable ICD-10-CM diagnosis code (T37.1X1A). 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. Inclusion terms: Poisoning by antimycobacterial drugs NOS. Excludes1 (not coded here): rifampicins (T36.6-); streptomycin (T36.5-); 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 T37.1X1A 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

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Poisoning by antimycobacterial drugs NOS

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

  • rifampicins (T36.6-)
  • streptomycin (T36.5-)
  • 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.

  • 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

Supplementary codes the tabular list directs you to add.

  • Use additional 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 T37.1X1A 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 T37.1X1A?

Per official ICD-10-CM Excludes1 instructions, T37.1X1A must not be reported together with: rifampicins (T36.6-); streptomycin (T36.5-); anti-infectives topically used for ear, nose and throat (T49.6-); anti-infectives topically used for eye (T49.5-).

Can T37.1X1A be reported alongside related conditions?

Per official ICD-10-CM Excludes2 instructions, T37.1X1A 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 T37.1X1A 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 T37.1X1A?

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 T37.1X1A in its code family, with their registry titles.

  • T37.0X6D — Underdosing of sulfonamides, subsequent encounter
  • T37.0X6S — Underdosing of sulfonamides, sequela
  • T37.1 — Poisoning by, adverse effect of and underdosing of antimycobacterial drugs
  • T37.1X — Poisoning by, adverse effect of and underdosing of antimycobacterial drugs
  • T37.1X1 — Poisoning by antimycobacterial drugs, accidental (unintentional)
  • T37.1X1D — Poisoning by antimycobacterial drugs, accidental (unintentional), subsequent encounter
  • T37.1X1S — Poisoning by antimycobacterial drugs, accidental (unintentional), sequela
  • T37.1X2 — Poisoning by antimycobacterial drugs, intentional self-harm
  • T37.1X2A — Poisoning by antimycobacterial drugs, intentional self-harm, initial encounter
  • T37.1X2D — Poisoning by antimycobacterial drugs, intentional self-harm, subsequent encounter

View all codes in the T37 family

Associated Substances (59)

Substances from the official ICD-10-CM Table of Drugs and Chemicals that map to this code.

  • Acetosulfone (sodium)
  • Aldesulfone sodium
  • Aminosalicylic acid
  • Aminosalylum
  • Antimycobacterial drug NEC
  • Antituberculars
  • Avlosulfon
  • Benzamidosalicylate (calcium)
  • Benzoylpas calcium
  • Bromosalicylhydroxamic acid
  • Chaulmosulfone
  • Clofazimine
  • Cyanacetyl hydrazide
  • Cycloserine
  • DADPS
  • Dapsone
  • DDS
  • Diaminodiphenylsulfone
  • Diasone (sodium)
  • Etambutol
  • Ethambutol
  • Ethionamide
  • Ethioniamide
  • Fenamisal
  • Glucosulfone sodium
  • Glyconiazide
  • INH
  • Isoniazid
  • Isonicotinic acid hydrazide
  • Izoniazid
  • Methaniazide
  • Morinamide
  • Morphazinamide
  • Nydrazid
  • Para-aminosalicylic acid
  • PAS
  • Pasiniazid
  • Pentylsalicylamide
  • Pirazinamide
  • Promacetin
  • Promin
  • Prothionamide
  • Protionamide
  • Pyrazinamide
  • Pyrazinoic acid (amide)
  • Rimifon
  • Salinazid
  • Solapsone
  • Solasulfone
  • Sulfonazide
  • Sulfones
  • Sulfoxone
  • Sulphadione
  • Terizidone
  • Thiambutosine
  • Thioacetazone
  • Thiocarlide
  • Tiocarlide
  • Trecator