Coding Rules & Guidelines

ICD-10-CM Categories

Browse specialized code groupings and validation rules based on official FY2026 guidelines. Ideal for pediatric, newborn, and complex clinical validation workflows.

Understanding Coding Rules & Guidelines

Official Guidelines

Coding guidelines are the official rules for code assignment. They ensure uniform practices and compliance with HIPAA regulations across all providers.

Excludes1 vs. Excludes2

Excludes1 means "not coded here" (conditions cannot coexist). Excludes2 means "not included here" (conditions may coexist and both can be coded).

Instructional Notes

Notes like "Code Also" or "Code First" provide specific sequencing instructions crucial for building a complete and accurate clinical picture.

Annual Refinement

Guidelines are updated annually (effective October 1st) to reflect clinical advancements and resolve coding ambiguities identified in the field.

Newborn Codes

42 codes

ICD-10-CM diagnoses designated by MCE age-conflict logic for perinatal/newborn patients (age 0 years only).

Source: Definitions of Medicare Code Edits v43.1, Age conflict section A.

Open Newborn Codes

Pediatric Codes

125 codes

ICD-10-CM diagnoses designated by MCE age-conflict logic for pediatric patients (age 0 through 17).

Source: Definitions of Medicare Code Edits v43.1, Age conflict section B.

Open Pediatric Codes

Maternity Codes

2,543 codes

ICD-10-CM diagnoses designated by MCE age-conflict logic for maternity patients (age 9 through 64).

Source: Definitions of Medicare Code Edits v43.1, Age conflict section C.

Open Maternity Codes

Adult Codes

856 codes

ICD-10-CM diagnoses designated by MCE age-conflict logic for adult patients (age 15 through 124).

Source: Definitions of Medicare Code Edits v43.1, Age conflict section D.

Open Adult Codes

Manifestation Codes

422 codes

ICD-10-CM manifestation diagnoses not allowed as principal diagnosis per MCE edit logic.

Source: Definitions of Medicare Code Edits v43.1, edit 6.

Open Manifestation Codes

Questionable Admission Codes

30 codes

ICD-10-CM principal diagnoses considered questionable for acute-care admission by MCE edit logic.

Source: Definitions of Medicare Code Edits v43.1, edit 8A.

Open Questionable Admission Codes

Questionable Obstetric Outcome Codes

19 codes

ICD-10-CM outcome-of-delivery diagnosis codes used in MCE questionable obstetric admission logic.

Source: Definitions of Medicare Code Edits v43.1, edit 8B section 3.

Open Questionable Obstetric Outcome Codes

Unacceptable Principal Diagnosis Codes

2,651 codes

ICD-10-CM codes identified as unacceptable when used as principal diagnosis by MCE edit logic.

Source: Definitions of Medicare Code Edits v43.1, edit 9.

Open Unacceptable Principal Diagnosis Codes