K21.9 Gastro-esophageal reflux disease without esophagitis

Billable ICD-10-CM code, FY2026.

Applicable to

• Esophageal reflux NOS

Applies from K21 Gastro-esophageal reflux disease

Excludes1 (never code together)

• newborn esophageal reflux (P78.83)

MS-DRG index

Defines the logic of DRG(s) 391-392 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 530.81 Esophageal reflux

Code annotations containing back-references to K21.9

Back-references to K21

• Code Also: R63.31 Pediatric feeding disorder, acute ("gastro-esophageal reflux disease (K21.-)")
• Code Also: R63.32 Pediatric feeding disorder, chronic ("gastro-esophageal reflux disease (K21.-)")

Diagnosis Index entries for K21.9

• Allergy, allergic (reaction) (to) › milk protein › gastroesophageal reflux
• Cardiochalasia
• Chalasia (cardiac sphincter)
• Disease, diseased › gastroesophageal reflux (GERD)
• GERD (gastroesophageal reflux disease)
• Reflux
• Reflux › acid
• Reflux › esophageal
• Reflux › gastroesophageal
• Relaxation › cardioesophageal

Nearby codes

• K21 Gastro-esophageal reflux disease
• K21.0 Gastro-esophageal reflux disease with esophagitis
• K21.00 Gastro-esophageal reflux disease with esophagitis, without bleeding
• K21.01 Gastro-esophageal reflux disease with esophagitis, with bleeding
• K21.9 Gastro-esophageal reflux disease without esophagitis (this code)