Skip to main content

T78.19XS ICD-10-CM Code: Other adverse food reactions, not elsewhere classified, 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.

  • MS-DRG 922 — OTHER INJURY, POISONING AND TOXIC EFFECT DIAGNOSES WITH MCC (MDC 21)
  • MS-DRG 923 — OTHER INJURY, POISONING AND TOXIC EFFECT DIAGNOSES 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.

Official Registry Overview & Definition

Other adverse food reactions, not elsewhere classified, sequela is a billable ICD-10-CM diagnosis code (T78.19S).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T78.19XS in the official ICD-10-CM tabular list.

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 Also

Additional codes that may be required to fully describe the encounter.

  • Code also, if applicable, place of occurrence, such as:
  • highway rest stop (Y92.523)
  • school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
  • service areas as the place of occurrence of the external cause (Y92.52-)
  • single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
  • transport vehicle as the place of occurrence of the external cause (Y92.81-)

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code to identify the type of reaction, if applicable

Frequently Compared Codes

The official Excludes notes on T78.19XS name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

  • FY2026 — 2025-10-01
    Added to the code set
    Other adverse food reactions, not elsewhere classified, sequela
    FY2026 changes

Verify Before Coding

  • 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.

Relationships & Classification

Official ICD-10-CM tabular notes on other codes that name T78.19XS or its code family.

1 Excludes1 notes: T75 (via T78.-).

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 922 (MDC 21), DRG 923 (MDC 21).

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

Clinical classification (AHRQ CCSR):INJ073 — Injury, sequela (default).

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

Contextual Map

Every relationship of T78.19XS 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]
  • T66-T78 — Other and unspecified effects of external causes [Hierarchy]

Referenced by Excludes1 notes

  • T75 — Other and unspecified effects of other external causes [Excludes1](via T78.-): “adverse effects NEC (T78.-)” · check together

Clinical classification (CCSR)

  • INJ073 — Injury, sequela [CCSR]

Potential MS-DRG

  • DRG 922 — OTHER INJURY, POISONING AND TOXIC EFFECT DIAGNOSES WITH MCC [MS-DRG]: “OTHER INJURY, POISONING AND TOXIC EFFECT DIAGNOSES WITH MCC (MDC 21)”
  • DRG 923 — OTHER INJURY, POISONING AND TOXIC EFFECT DIAGNOSES WITHOUT MCC [MS-DRG]: “OTHER INJURY, POISONING AND TOXIC EFFECT DIAGNOSES WITHOUT MCC (MDC 21)”

MDC crossing · procedures (32029)

  • MDC 21 — Injuries, Poisonings and Toxic Effects of Drugs [MDC crossing]: “Injuries, Poisonings and Toxic Effects of Drugs — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”
  • 0016070 — Bypass Cerebral Ventricle to Nasopharynx with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Nasopharynx with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016071 — Bypass Cerebral Ventricle to Mastoid Sinus with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Mastoid Sinus with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016072 — Bypass Cerebral Ventricle to Atrium with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Atrium with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016073 — Bypass Cerebral Ventricle to Blood Vessel with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Blood Vessel with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016074 — Bypass Cerebral Ventricle to Pleural Cavity with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Pleural Cavity with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • and 32024 more

Nearest codes (40)

  • T78 — Adverse effects, not elsewhere classified [Sibling]
  • T78.119 — Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified [Sibling]
  • T78.119A — Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, initial encounter [Sibling]
  • T78.119D — Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, subsequent encounter [Sibling]
  • T78.119S — Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, sequela [Sibling]
  • T78.12 — Other adverse food reaction due to eggs [Sibling]
  • T78.120 — Other adverse food reaction due to egg with tolerance to baked egg [Sibling]
  • T78.120A — Other adverse food reaction due to egg with tolerance to baked egg, initial encounter [Sibling]
  • and 32 more

Change history

  • FY2026 — Added to the code set [Change history]

Frequently Asked Questions (FAQ) & Clinical Guidance

Does T78.19XS require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T78.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T78.19XS in its code family, with their registry titles.

  • T78.129D — Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, subsequent encounter
  • T78.129S — Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, sequela
  • T78.19 — Other adverse food reactions, not elsewhere classified
  • T78.19XA — Other adverse food reactions, not elsewhere classified, initial encounter
  • T78.19XD — Other adverse food reactions, not elsewhere classified, subsequent encounter
  • T78.2 — Anaphylactic shock, unspecified
  • T78.2XXA — Anaphylactic shock, unspecified, initial encounter
  • T78.2XXD — Anaphylactic shock, unspecified, subsequent encounter
  • T78.2XXS — Anaphylactic shock, unspecified, sequela
  • T78.3 — Angioneurotic edema

View all codes in the T78 family