ICD-10 · PDGM grouping
T78 Adverse effects, not elsewhere classified
All 81 codes in the T78 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in family
81
Can lead a claim
78
Cannot lead a claim
3
What CMS assigns to T78
78 of the 81 codes group to MMTA - Other; 3 are assigned no clinical group. None of the 81 is assigned a comorbidity subgroup. 78 of the 81 can lead a claim.
Every code in T78
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| T78.0 Anaphylactic reaction due to food | ||||
| T78.00 Anaphylactic reaction due to unspecified food | ||||
| T78.00XA | Anaphylactic reaction due to unspecified food, initial encounterCMS: Anaphylactic reaction due to unspecified food, init encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| T78.00XD | Anaphylactic reaction due to unspecified food, subsequent encounterCMS: Anaphylactic reaction due to unspecified food, subs encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| T78.00XS | Anaphylactic reaction due to unspecified food, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| T78.01 Anaphylactic reaction due to peanuts | ||||
| T78.01XA | Anaphylactic reaction due to peanuts, initial encounter | Can lead a claim | A | None |
| T78.01XD | Anaphylactic reaction due to peanuts, subsequent encounter | Can lead a claim | A | None |
| T78.01XS | Anaphylactic reaction due to peanuts, sequela | Can lead a claim | A | None |
| T78.02 Anaphylactic reaction due to shellfish (crustaceans) | ||||
| T78.02XA | Anaphylactic reaction due to shellfish (crustaceans), initial encounterCMS: Anaphylactic reaction due to shellfish (crustaceans), init | Can lead a claim | A | None |
| T78.02XD | Anaphylactic reaction due to shellfish (crustaceans), subsequent encounterCMS: Anaphylactic reaction due to shellfish (crustaceans), subs | Can lead a claim | A | None |
| T78.02XS | Anaphylactic reaction due to shellfish (crustaceans), sequelaCMS: Anaphyl reaction due to shellfish (crustaceans), sequela | Can lead a claim | A | None |
| T78.03 Anaphylactic reaction due to other fish | ||||
| T78.03XA | Anaphylactic reaction due to other fish, initial encounter | Can lead a claim | A | None |
| T78.03XD | Anaphylactic reaction due to other fish, subsequent encounterCMS: Anaphylactic reaction due to other fish, subs encntr | Can lead a claim | A | None |
| T78.03XS | Anaphylactic reaction due to other fish, sequela | Can lead a claim | A | None |
| T78.04 Anaphylactic reaction due to fruits and vegetables | ||||
| T78.04XA | Anaphylactic reaction due to fruits and vegetables, initial encounterCMS: Anaphylactic reaction due to fruits and vegetables, init | Can lead a claim | A | None |
| T78.04XD | Anaphylactic reaction due to fruits and vegetables, subsequent encounterCMS: Anaphylactic reaction due to fruits and vegetables, subs | Can lead a claim | A | None |
| T78.04XS | Anaphylactic reaction due to fruits and vegetables, sequela | Can lead a claim | A | None |
| T78.05 Anaphylactic reaction due to tree nuts and seeds | ||||
| T78.05XA | Anaphylactic reaction due to tree nuts and seeds, initial encounterCMS: Anaphylactic reaction due to tree nuts and seeds, init | Can lead a claim | A | None |
| T78.05XD | Anaphylactic reaction due to tree nuts and seeds, subsequent encounterCMS: Anaphylactic reaction due to tree nuts and seeds, subs | Can lead a claim | A | None |
| T78.05XS | Anaphylactic reaction due to tree nuts and seeds, sequela | Can lead a claim | A | None |
| T78.06 Anaphylactic reaction due to food additives | ||||
| T78.06XA | Anaphylactic reaction due to food additives, initial encounterCMS: Anaphylactic reaction due to food additives, init encntr | Can lead a claim | A | None |
| T78.06XD | Anaphylactic reaction due to food additives, subsequent encounterCMS: Anaphylactic reaction due to food additives, subs encntr | Can lead a claim | A | None |
| T78.06XS | Anaphylactic reaction due to food additives, sequela | Can lead a claim | A | None |
| T78.07 Anaphylactic reaction due to milk and dairy products | ||||
| T78.070 Anaphylactic reaction due to milk and dairy products with tolerance to baked milk | ||||
| T78.070A | Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, initial encounterCMS: Anaphyl rct d/t milk /dair prod w tolerance to bkd milk,init | Can lead a claim | A | None |
| T78.070D | Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, subsequent encounterCMS: Anaphyl rct d/t milk /dair prod w tolerance to bkd milk,subs | Can lead a claim | A | None |
| T78.070S | Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, sequelaCMS: Anaphyl rct d/t milk /dair prod w tolerance to bkd milk,sqla | Can lead a claim | A | None |
| T78.071 Anaphylactic reaction due to milk and dairy products with reactivity to baked milk | ||||
| T78.071A | Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, initial encounterCMS: Anaphyl rct d/t milk and dair prod w rct to bkd milk, init | Can lead a claim | A | None |
| T78.071D | Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, subsequent encounterCMS: Anaphyl rct d/t milk and dair prod w rct to bkd milk, subs | Can lead a claim | A | None |
| T78.071S | Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, sequelaCMS: Anaphyl rct d/t milk and dair prod w rct to bkd milk, sqla | Can lead a claim | A | None |
| T78.079 Anaphylactic reaction due to milk and dairy products, unspecified | ||||
| T78.079A | Anaphylactic reaction due to milk and dairy products, unspecified, initial encounterCMS: Anaphyl reaction due to milk and dairy products, unsp, init | Can lead a claim | A | None |
| T78.079D | Anaphylactic reaction due to milk and dairy products, unspecified, subsequent encounterCMS: Anaphyl reaction due to milk and dairy products, unsp, subs | Can lead a claim | A | None |
| T78.079S | Anaphylactic reaction due to milk and dairy products, unspecified, sequelaCMS: Anaphyl reaction due to milk and dairy prod, unsp, sequela | Can lead a claim | A | None |
| T78.08 Anaphylactic reaction due to eggs | ||||
| T78.080 Anaphylactic reaction due to egg with tolerance to baked egg | ||||
| T78.080A | Anaphylactic reaction due to egg with tolerance to baked egg, initial encounterCMS: Anaphyl react due to egg with tolerance to baked egg, init | Can lead a claim | A | None |
| T78.080D | Anaphylactic reaction due to egg with tolerance to baked egg, subsequent encounterCMS: Anaphyl react due to egg with tolerance to baked egg, subs | Can lead a claim | A | None |
| T78.080S | Anaphylactic reaction due to egg with tolerance to baked egg, sequelaCMS: Anaphyl react due to egg with tolerance to baked egg, sqla | Can lead a claim | A | None |
| T78.081 Anaphylactic reaction due to egg with reactivity to baked egg | ||||
| T78.081A | Anaphylactic reaction due to egg with reactivity to baked egg, initial encounterCMS: Anaphyl reaction due to egg with rct to baked egg, init | Can lead a claim | A | None |
| T78.081D | Anaphylactic reaction due to egg with reactivity to baked egg, subsequent encounterCMS: Anaphyl reaction due to egg with rct to baked egg, subs | Can lead a claim | A | None |
| T78.081S | Anaphylactic reaction due to egg with reactivity to baked egg, sequelaCMS: Anaphyl reaction due to egg with rct to baked egg, sequela | Can lead a claim | A | None |
| T78.089 Anaphylactic reaction due to eggs, unspecified | ||||
| T78.089A | Anaphylactic reaction due to eggs, unspecified, initial encounterCMS: Anaphylactic reaction due to eggs, unspecified, init | Can lead a claim | A | None |
| T78.089D | Anaphylactic reaction due to eggs, unspecified, subsequent encounterCMS: Anaphylactic reaction due to eggs, unspecified, subs | Can lead a claim | A | None |
| T78.089S | Anaphylactic reaction due to eggs, unspecified, sequela | Can lead a claim | A | None |
| T78.09 Anaphylactic reaction due to other food products | ||||
| T78.09XA | Anaphylactic reaction due to other food products, initial encounterCMS: Anaphylactic reaction due to oth food products, init encntr | Can lead a claim | A | None |
| T78.09XD | Anaphylactic reaction due to other food products, subsequent encounterCMS: Anaphylactic reaction due to oth food products, subs encntr | Can lead a claim | A | None |
| T78.09XS | Anaphylactic reaction due to other food products, sequela | Can lead a claim | A | None |
| T78.1 Other adverse food reactions, not elsewhere classified | ||||
| T78.11 Other adverse food reactions due to milk and dairy products | ||||
| T78.110 Other adverse food reactions due to milk and dairy products with tolerance to baked milk | ||||
| T78.110A | Other adverse food reactions due to milk and dairy products with tolerance to baked milk, initial encounterCMS: Oth ad rcts d/t milk /dair prod w tolerance to bkd milk,init | Can lead a claim | A | None |
| T78.110D | Other adverse food reactions due to milk and dairy products with tolerance to baked milk, subsequent encounterCMS: Oth ad rcts d/t milk /dair prod w tolerance to bkd milk,subs | Can lead a claim | A | None |
| T78.110S | Other adverse food reactions due to milk and dairy products with tolerance to baked milk, sequelaCMS: Oth ad rcts d/t milk /dair prod w tolerance to bkd milk,sqla | Can lead a claim | A | None |
| T78.111 Other adverse food reaction due to milk and dairy products with reactivity to baked milk | ||||
| T78.111A | Other adverse food reaction due to milk and dairy products with reactivity to baked milk, initial encounterCMS: Oth ad rct d/t milk and dair prod with rct to bkd milk, init | Can lead a claim | A | None |
| T78.111D | Other adverse food reaction due to milk and dairy products with reactivity to baked milk, subsequent encounterCMS: Oth ad rct d/t milk and dair prod with rct to bkd milk, subs | Can lead a claim | A | None |
| T78.111S | Other adverse food reaction due to milk and dairy products with reactivity to baked milk, sequelaCMS: Oth ad rct d/t milk and dair prod with rct to bkd milk, sqla | Can lead a claim | A | None |
| T78.119 Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified | ||||
| T78.119A | Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, initial encounterCMS: Oth ad rct d/t milk /dair prod w bkd milk tol/rct,unsp,init | Can lead a claim | A | None |
| T78.119D | Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, subsequent encounterCMS: Oth ad rct d/t milk /dair prod w bkd milk tol/rct,unsp,subs | Can lead a claim | A | None |
| T78.119S | Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, sequelaCMS: Oth ad rct d/t milk /dair prod w bkd milk tol/rct,unsp,sqla | Can lead a claim | A | None |
| T78.12 Other adverse food reaction due to eggs | ||||
| T78.120 Other adverse food reaction due to egg with tolerance to baked egg | ||||
| T78.120A | Other adverse food reaction due to egg with tolerance to baked egg, initial encounterCMS: Other ad food react d/t egg with tolerance to bkd egg, init | Can lead a claim | A | None |
| T78.120D | Other adverse food reaction due to egg with tolerance to baked egg, subsequent encounterCMS: Other ad food react d/t egg with tolerance to bkd egg, subs | Can lead a claim | A | None |
| T78.120S | Other adverse food reaction due to egg with tolerance to baked egg, sequelaCMS: Other ad food react d/t egg with tolerance to bkd egg, sqla | Can lead a claim | A | None |
| T78.121 Other adverse food reaction due to egg with reactivity to baked egg | ||||
| T78.121A | Other adverse food reaction due to egg with reactivity to baked egg, initial encounterCMS: Other advrs food react d/t egg with rct to baked egg, init | Can lead a claim | A | None |
| T78.121D | Other adverse food reaction due to egg with reactivity to baked egg, subsequent encounterCMS: Other advrs food react d/t egg with rct to baked egg, subs | Can lead a claim | A | None |
| T78.121S | Other adverse food reaction due to egg with reactivity to baked egg, sequelaCMS: Other advrs food react d/t egg with rct to baked egg, sqla | Can lead a claim | A | None |
| T78.129 Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified | ||||
| T78.129A | Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, initial encounterCMS: Other ad food react d/t egg with bkd egg tol/rct, unsp, init | Can lead a claim | A | None |
| T78.129D | Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, subsequent encounterCMS: Other ad food react d/t egg with bkd egg tol/rct, unsp, subs | Can lead a claim | A | None |
| T78.129S | Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, sequelaCMS: Other ad food react d/t egg with bkd egg tol/rct, unsp, sqla | Can lead a claim | A | None |
| T78.19 Other adverse food reactions, not elsewhere classified | ||||
| T78.19XA | Other adverse food reactions, not elsewhere classified, initial encounterCMS: Other adverse food reactions, NEC, initial encounter | Can lead a claim | A | None |
| T78.19XD | Other adverse food reactions, not elsewhere classified, subsequent encounterCMS: Other adverse food reactions, NEC, subsequent encounter | Can lead a claim | A | None |
| T78.19XS | Other adverse food reactions, not elsewhere classified, sequelaCMS: Other adverse food reactions, NEC, sequela | Can lead a claim | A | None |
| T78.2 Anaphylactic shock, unspecified | ||||
| T78.2XXA | Anaphylactic shock, unspecified, initial encounter | Can lead a claim | A | None |
| T78.2XXD | Anaphylactic shock, unspecified, subsequent encounter | Can lead a claim | A | None |
| T78.2XXS | Anaphylactic shock, unspecified, sequela | Can lead a claim | A | None |
| T78.3 Angioneurotic edema | ||||
| T78.3XXA | Angioneurotic edema, initial encounter | Can lead a claim | A | None |
| T78.3XXD | Angioneurotic edema, subsequent encounter | Can lead a claim | A | None |
| T78.3XXS | Angioneurotic edema, sequela | Can lead a claim | A | None |
| T78.4 Other and unspecified allergy | ||||
| T78.40 Allergy, unspecified | ||||
| T78.40XA | Allergy, unspecified, initial encounter | Can lead a claim | A | None |
| T78.40XD | Allergy, unspecified, subsequent encounter | Can lead a claim | A | None |
| T78.40XS | Allergy, unspecified, sequela | Can lead a claim | A | None |
| T78.41 Arthus phenomenon | ||||
| T78.41XA | Arthus phenomenon, initial encounter | Can lead a claim | A | None |
| T78.41XD | Arthus phenomenon, subsequent encounter | Can lead a claim | A | None |
| T78.41XS | Arthus phenomenon, sequela | Can lead a claim | A | None |
| T78.49 Other allergy | ||||
| T78.49XA | Other allergy, initial encounter | Can lead a claim | A | None |
| T78.49XD | Other allergy, subsequent encounter | Can lead a claim | A | None |
| T78.49XS | Other allergy, sequela | Can lead a claim | A | None |
| T78.8 Other adverse effects, not elsewhere classified | ||||
| T78.8XXA | Other adverse effects, not elsewhere classified, initial encounterCMS: Other adverse effects, not elsewhere classified, init encntr | Can lead a claim | A | None |
| T78.8XXD | Other adverse effects, not elsewhere classified, subsequent encounterCMS: Other adverse effects, not elsewhere classified, subs encntr | Can lead a claim | A | None |
| T78.8XXS | Other adverse effects, not elsewhere classified, sequela | Can lead a claim | A | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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