O99.612 Diseases of the digestive system complicating pregnancy, second trimester

Billable ICD-10-CM code, FY2026.

Applies from O99 Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

Includes

• conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care

Excludes2 (not included here)

• when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)

Use additional code

• code to identify specific condition

Applies from O99.6 Diseases of the digestive system complicating pregnancy, childbirth and the puerperium

Applicable to

• Conditions in K00-K93

Excludes2 (not included here)

• hemorrhoids in pregnancy (O22.4-)
• liver and biliary tract disorders in pregnancy, childbirth and the puerperium (O26.6-)

MS-DRG index

Defines the logic of DRG(s) 817-819 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 648.91 Other current conditions classifiable elsewhere of mother, delivered, with or without mention of antepartum condition (approximate)
• 648.93 Other current conditions classifiable elsewhere of mother, antepartum condition or complication (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Code annotations containing back-references to O99.612

Back-references to O99.61

• Code First: K05.1 Chronic gingivitis (", if applicable, diseases of the digestive system complicating pregnancy (O99.61-)")

Nearby codes

• O99.52 Diseases of the respiratory system complicating childbirth
• O99.53 Diseases of the respiratory system complicating the puerperium
• O99.6 Diseases of the digestive system complicating pregnancy, childbirth and the puerperium
• O99.61 Diseases of the digestive system complicating pregnancy
• O99.611 Diseases of the digestive system complicating pregnancy, first trimester
• O99.612 Diseases of the digestive system complicating pregnancy, second trimester (this code)
• O99.613 Diseases of the digestive system complicating pregnancy, third trimester
• O99.619 Diseases of the digestive system complicating pregnancy, unspecified trimester
• O99.62 Diseases of the digestive system complicating childbirth
• O99.63 Diseases of the digestive system complicating the puerperium
• O99.7 Diseases of the skin and subcutaneous tissue complicating pregnancy, childbirth and the puerperium