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ICD-10/O99.412

O99.412 ICD-10-CM Code: Diseases of the circulatory system complicating pregnancy, second trimester

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

  • MS-DRG 817 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITH MCC (MDC 14)
  • MS-DRG 818 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITH CC (MDC 14)
  • MS-DRG 819 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITHOUT CC/MCC (MDC 14)
  • MS-DRG 831 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITH MCC (MDC 14)
  • MS-DRG 832 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITH CC (MDC 14)
  • MS-DRG 833 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITHOUT CC/MCC (MDC 14)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Official Registry Overview & Definition

Diseases of the circulatory system complicating pregnancy, second trimester is a billable ICD-10-CM diagnosis code (O99.412).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for O99.412 in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

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

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

  • peripartum cardiomyopathy (O90.3)

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

  • hypertensive disorders (O10-O16)
  • obstetric embolism (O88.-)
  • venous complications and cerebrovenous sinus thrombosis in labor, childbirth and the puerperium (O87.-)
  • venous complications and cerebrovenous sinus thrombosis in pregnancy (O22.-)
  • when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code to identify specific condition

Nearest Codes in This Family

Official ICD-10-CM classifications closest to O99.412 in its code family, with their registry titles.

  • O99.354 — Diseases of the nervous system complicating childbirth
  • O99.355 — Diseases of the nervous system complicating the puerperium
  • O99.4 — Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium
  • O99.41 — Diseases of the circulatory system complicating pregnancy
  • O99.411 — Diseases of the circulatory system complicating pregnancy, first trimester
  • O99.413 — Diseases of the circulatory system complicating pregnancy, third trimester
  • O99.419 — Diseases of the circulatory system complicating pregnancy, unspecified trimester
  • O99.42 — Diseases of the circulatory system complicating childbirth
  • O99.43 — Diseases of the circulatory system complicating the puerperium
  • O99.5 — Diseases of the respiratory system complicating pregnancy, childbirth and the puerperium

View all codes in the O99 family