O99
ICD-10Non-billable categoryOth maternal diseases classd elsw but compl preg/chldbrth
Official ICD-10-CM descriptor (FY2026)
Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
O99 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Includes
- conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)
Use additional code
Report an additional code to identify the associated condition.
- code to identify specific condition
More specific codes under O99
- O99.0Anemia complicating pregnancy, childbirth and the puerperiumcategory
- O99.1Other dis blood/immune compl preg/childbrthcategory
- O99.2Endo, nutritional and metabolic diseases compl preg/chldbrthcategory
- O99.3Mental disord and dis of the nervous sys compl preg/chldbrthcategory
- O99.4Diseases of the circulatory system compl preg/chldbrthcategory
- O99.5Diseases of the respiratory system compl preg/chldbrthcategory
- O99.6Diseases of the digestive system compl preg/chldbrthcategory
- O99.7Diseases of the skin, subcu compl preg/chldbrthcategory
- O99.8Oth diseases and conditions compl preg/chldbrthcategory
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.