News: CMS releases FY 2026 ICD-10-CM code update

CMS recently released the fiscal year (FY) 2026 ICD-10-CM update, which includes 487 new diagnosis codes effective October 1, 2025. The new codes cover a range of diagnoses, so be sure to review the code update files. This article covers a few areas that are receiving new codes.

War operations

The update includes a dozen codes to capture injuries to military personnel and civilians caused by war, civil insurrection, and peacekeeping missions:

• Y36.A1XA, Low level blast overpressure in war operations, initial encounter
• Y36.A1XD, Low level blast overpressure in war operations, subsequent encounter
• Y36.A1XS, Low level blast overpressure in war operations, sequela
• Y36.A2XA, High level blast overpressure in war operations, initial encounter
• Y36.A2XD, High level blast overpressure in war operations, subsequent encounter
• Y36.A2XS, High level blast overpressure in war operations, sequela
• Y37.A1XA, Low level blast overpressure in military operations, initial encounter
• Y37.A1XD, Low level blast overpressure in military operations, subsequent encounter
• Y37.A1XS, Low level blast overpressure in military operations, sequela
• Y37.A2XA, High level blast overpressure in military operations, initial encounter
• Y37.A2XD, High level blast overpressure in military operations, subsequent encounter
• Y37.A2XS, High level blast overpressure in military operations, sequela

Eggs

The update includes several new codes related to eggs, including nine codes to capture adverse reactions to eggs:

• T78.120A, Other adverse food reaction due to egg with tolerance to baked egg, initial encounter
• T78.120D, Other adverse food reaction due to egg with tolerance to baked egg, subsequent encounter
• T78.120S, Other adverse food reaction due to egg with tolerance to baked egg, sequela
• T78.121A, Other adverse food reaction due to egg with reactivity to baked egg, initial encounter            
• T78.121D, Other adverse food reaction due to egg with reactivity to baked egg, subsequent encounter             
• T78.121S, Other adverse food reaction due to egg with reactivity to baked egg, sequela
• T78.129A, Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, initial encounter
• 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

Nine new codes also address anaphylactic reactions to eggs:

• T78.080A, Anaphylactic reaction due to egg with tolerance to baked egg, initial encounter    
• T78.080D, Anaphylactic reaction due to egg with tolerance to baked egg, subsequent encounter
• T78.080S, Anaphylactic reaction due to egg with tolerance to baked egg, sequela
• T78.081A, Anaphylactic reaction due to egg with reactivity to baked egg, initial encounter
• T78.081D, Anaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter
• T78.081S, Anaphylactic reaction due to egg with reactivity to baked egg, sequela   
• T78.089A, Anaphylactic reaction due to eggs, unspecified, initial encounter
• T78.089D, Anaphylactic reaction due to eggs, unspecified, subsequent encounter
• T78.089S, Anaphylactic reaction due to eggs, unspecified, sequela

Lastly, the update includes three codes related to egg allergies:

• Z91.0120, Allergy to eggs, unspecified
• Z91.0121, Allergy to eggs with tolerance to baked egg
• Z91.0122, Allergy to eggs with reactivity to baked egg

Milk and dairy products

Similar to eggs, the update also includes several new codes related to milk and dairy products, including nine new codes related to adverse reactions:

• T78.110A, Other adverse food reactions due to milk and dairy products with tolerance to baked milk, initial encounter
• T78.110D, Other adverse food reactions due to milk and dairy products with tolerance to baked milk, subsequent encounter
• T78.110S, Other adverse food reactions due to milk and dairy products with tolerance to baked milk, sequela
• T78.111A, Other adverse food reaction due to milk and dairy products with reactivity to baked milk, initial encounter
• T78.111D, Other adverse food reaction due to milk and dairy products with reactivity to baked milk, subsequent encounter
• T78.111S, Other adverse food reaction due to milk and dairy products with reactivity to baked milk, sequela
• T78.119A, Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, initial encounter
• T78.119D, Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, subsequent encounter
• T78.119S, Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, sequela

Nine new codes also address anaphylactic reactions to milk and dairy products:

• T78.070A, Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, initial encounter
• T78.070D, Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, subsequent encounter
• T78.070S, Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, sequela
• T78.071A, Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, initial encounter
• T78.071D, Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, subsequent encounter
• T78.071S, Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, sequela
• T78.079A, Anaphylactic reaction due to milk and dairy products, unspecified, initial encounter
• T78.079D, Anaphylactic reaction due to milk and dairy products, unspecified, subsequent encounter
• T78.079S, Anaphylactic reaction due to milk and dairy products, unspecified, sequela          

Lastly, the update includes three codes related to milk product allergies:

• Z91.0110, Allergy to milk products, unspecified
• Z91.0111, Allergy to milk products with tolerance to baked milk      
• Z91.0112, Allergy to milk products with reactivity to baked milk

Editor’s note: This article was originally published in JustCoding. To access the CMS 2026 ICD-10-CM update, click here.