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ICD-10/O99.113

O99.113 ICD-10-CM Code: Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, third 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.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, third trimester is a billable ICD-10-CM diagnosis code (O99.113).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for O99.113 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.

  • hemorrhage with coagulation defects (O45.-, O46.0-, O67.0, O72.3)

Excludes2 — Not Included Here

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

  • 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 O99.113 in its code family, with their registry titles.

  • O99.03 — Anemia complicating the puerperium
  • O99.1 — Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, childbirth and the puerperium
  • O99.11 — Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy
  • O99.111 — Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, first trimester
  • O99.112 — Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, second trimester
  • O99.119 — Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, unspecified trimester
  • O99.12 — Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth
  • O99.13 — Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating the puerperium
  • O99.2 — Endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium
  • O99.21 — Obesity complicating pregnancy, childbirth, and the puerperium

View all codes in the O99 family