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ICD-10/T44.1X6S

T44.1X6S ICD-10-CM Code: Underdosing of other parasympathomimetics [cholinergics], sequela

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, Appendix B.

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.

Official Registry Overview & Definition

Underdosing of other parasympathomimetics [cholinergics], sequela is a billable ICD-10-CM diagnosis code (T44.1X6S).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T44.1X6S 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 generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

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-)

Change history

  • FY2020 — 2019-10-01
    Description revised
    Underdosing of other parasympathomimetics, sequela → Underdosing of other parasympathomimetics [cholinergics], sequela
    FY2020 changes

Verify Before Coding

  • Billable — reportable as written.
  • Principal-diagnosis restriction. The Medicare Code Editor lists this code as unacceptable as a principal diagnosis: it describes a circumstance influencing health status rather than a current illness or injury being treated. It is valid as a secondary diagnosis.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Contextual Map

Every relationship of T44.1X6S in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • S00-T88 — Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) (S00-T88) [Hierarchy]
  • T36-T50 — Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances [Hierarchy]
  • T44-T46 — Cardiovascular & Gastrointestinal [Hierarchy]

Clinical classification (CCSR)

  • INJ075 — Poisoning/toxic effect/adverse effects/underdosing, sequela [CCSR]

Potential MS-DRG

  • DRG 949 — AFTERCARE WITH CC/MCC [MS-DRG]: “AFTERCARE WITH CC/MCC (MDC 23)”
  • DRG 950 — AFTERCARE WITHOUT CC/MCC [MS-DRG]: “AFTERCARE WITHOUT CC/MCC (MDC 23)”

Drugs & chemicals (11)

  • Aceclidine — Aceclidine — Underdosing [Drug table]: “Aceclidine (Underdosing)”
  • Arecoline — Arecoline — Underdosing [Drug table]: “Arecoline (Underdosing)”
  • Benzpyrinium bromide — Benzpyrinium bromide — Underdosing [Drug table]: “Benzpyrinium bromide (Underdosing)”
  • Bethanechol — Bethanechol — Underdosing [Drug table]: “Bethanechol (Underdosing)”
  • Carbachol — Carbachol — Underdosing [Drug table]: “Carbachol (Underdosing)”
  • Carbamylcholine chloride — Carbamylcholine chloride — Underdosing [Drug table]: “Carbamylcholine chloride (Underdosing)”
  • CholinergicNEC (drug) — CholinergicNEC (drug) — Underdosing [Drug table]: “CholinergicNEC (drug) (Underdosing)”
  • Methacholine — Methacholine — Underdosing [Drug table]: “Methacholine (Underdosing)”
  • and 3 more

Nearest codes (40)

  • T44 — Poisoning by, adverse effect of and underdosing of drugs primarily affecting the autonomic nervous system [Sibling]
  • T44.1X1S — Poisoning by other parasympathomimetics [cholinergics], accidental (unintentional), sequela [Sibling]
  • T44.1X2 — Poisoning by other parasympathomimetics [cholinergics], intentional self-harm [Sibling]
  • T44.1X2A — Poisoning by other parasympathomimetics [cholinergics], intentional self-harm, initial encounter [Sibling]
  • T44.1X2D — Poisoning by other parasympathomimetics [cholinergics], intentional self-harm, subsequent encounter [Sibling]
  • T44.1X2S — Poisoning by other parasympathomimetics [cholinergics], intentional self-harm, sequela [Sibling]
  • T44.1X3 — Poisoning by other parasympathomimetics [cholinergics], assault [Sibling]
  • T44.1X3A — Poisoning by other parasympathomimetics [cholinergics], assault, initial encounter [Sibling]
  • and 32 more

Change history

  • FY2020 — Description revised [Change history]

Relationships & Classification

Clinical classification (AHRQ CCSR):INJ075 — Poisoning/toxic effect/adverse effects/underdosing, sequela.

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Potential MS-DRG Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 2 MS-DRGs: DRG 949 (MDC 23), DRG 950 (MDC 23).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Frequently Asked Questions (FAQ) & Clinical Guidance

Does T44.1X6S require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T44.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T44.1X6S in its code family, with their registry titles.

  • T44.1X5D — Adverse effect of other parasympathomimetics [cholinergics], subsequent encounter
  • T44.1X5S — Adverse effect of other parasympathomimetics [cholinergics], sequela
  • T44.1X6 — Underdosing of other parasympathomimetics [cholinergics]
  • T44.1X6A — Underdosing of other parasympathomimetics [cholinergics], initial encounter
  • T44.1X6D — Underdosing of other parasympathomimetics [cholinergics], subsequent encounter
  • T44.2 — Poisoning by, adverse effect of and underdosing of ganglionic blocking drugs
  • T44.2X — Poisoning by, adverse effect of and underdosing of ganglionic blocking drugs
  • T44.2X1 — Poisoning by ganglionic blocking drugs, accidental (unintentional)
  • T44.2X1A — Poisoning by ganglionic blocking drugs, accidental (unintentional), initial encounter
  • T44.2X1D — Poisoning by ganglionic blocking drugs, accidental (unintentional), subsequent encounter

View all codes in the T44 family

Associated Substances (11)

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

  • Aceclidine
  • Arecoline
  • Benzpyrinium bromide
  • Bethanechol
  • Carbachol
  • Carbamylcholine chloride
  • CholinergicNEC (drug)
  • Methacholine
  • Parasympathomimetic drug NEC
  • Pilocarpine
  • Pilocarpusextract (jaborandi)