ICDcodes.org
FY2027

O99.119 — Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, unspecified trimester

BillableUnspecifiedCC

Is O99.119 billable?

Yes, but O99.119 is an unspecified code. O99.119 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, O99.119 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting O99.119 — the more specific alternatives are listed below.

O99.119 at a glance

CodeO99.119
DescriptionOther diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, unspecified trimester
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does O99.119 group to?

O99.119 sits in MDC 14 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 817Other Antepartum Diagnoses with O.R. Procedures with MCCsurgical
  • 818Other Antepartum Diagnoses with O.R. Procedures with CCsurgical
  • 819Other Antepartum Diagnoses with O.R. Procedures without CC/MCCsurgical

As a secondary diagnosis, O99.119 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is O99.119 listed in the Alphabetic Index?

The Alphabetic Index lists these routes under O99.11, the nearest indexed parent of O99.119. Use them to find the family, then select the specific code.

  • Pregnancy › complicated by › immune disorders NEC (single) (uterine)
  • Pregnancy › complicated by › diseases of › blood NEC (single) (uterine)

Excludes1 — never code together — inherited from Chapter 15

The conditions below can never be reported together with O99.119 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • supervision of normal pregnancy (Z34.-)

Excludes1 — never code together — inherited from O99.1

The conditions below can never be reported together with O99.119 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

Use additional code — inherited from Chapter 15

Report an additional code alongside O99.119 to fully describe the condition. O99.119 is sequenced first.

  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Use additional code — inherited from O99

Report an additional code alongside O99.119 to fully describe the condition. O99.119 is sequenced first.

  • code to identify specific condition

Excludes2 — not included here — inherited from Chapter 15

The conditions below are not part of O99.119, but a patient may have both at the same time. When documentation supports it, O99.119 and the excluded code may both be reported.

  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Excludes2 — not included here — inherited from O99

The conditions below are not part of O99.119, but a patient may have both at the same time. When documentation supports it, O99.119 and the excluded code may both be reported.

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

How long has O99.119 existed?

O99.119 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

What other codes are in the O99.11 family? (3)