O99 ICD-10-CA category: Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
O99 isn’t a code on its own. Choose one of the 45 codes beneath it, the one the documentation supports.
Official description
O99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
ICD-10-CA · Canada
Codes in O99
O99 isn’t a code on its own. Open the group that matches what the note documents.
O99.0Anaemia complicating pregnancy, childbirth and the puerperium (5 codes)O99.1Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, childbirth and the puerperium (5 codes)O99.2Endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium (5 codes)O99.3Mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium (5 codes)O99.4Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium (5 codes)O99.5Diseases of the respiratory system complicating pregnancy, childbirth and the puerperium (5 codes)O99.6Diseases of the digestive system complicating pregnancy, childbirth and the puerperium (5 codes)O99.7Diseases of the skin and subcutaneous tissue complicating pregnancy, childbirth and the puerperium (5 codes)O99.8Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium (5 codes)Notes for O99
As CIHI prints them, with any note O99 takes from the headings above it.
Use additional code
Add a code for this detail when the note documents it.
- Use additional code to identify specific condition.
Excludes
Conditions classified elsewhere.
- Infectious and parasitic diseases (O98.-)injury, poisoning and certain other consequences of external causes (S00-T98)when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)
- Certain diseases or injuries complicating pregnancy, childbirth, and the puerperium classified elsewhere:external causes (for mortality) (V,W,X,Y)injury, poisoning and certain other consequences of external causes (S00-T88.1, T88.6-T98)mental and behavioural disorders associated with the puerperium (F53.-)obstetrical tetanus (A34)postpartum necrosis of pituitary gland (E23.0)puerperal osteomalacia (M83.0)supervision of:• high-risk pregnancy (Z35.-)• normal pregnancy (Z34.-)From Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
Note
- This category includes conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care and for which the Alphabetical Index does not indicate a specific rubric in Chapter XV.
- For use of categories O95-O97 reference should be made to the mortality coding rules and guidelines.From O94-O99 Other obstetric conditions, not elsewhere classified
- The codes included in this chapter are to be used for conditions related to or aggravated by the pregnancy, childbirth or by the puerperium (maternal causes or obstetric causes)From Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
Where O99 sits
- 1ChapterChapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
- 2Block O94-O99Other obstetric conditions, not elsewhere classified
- 3Category O99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is O99 a valid ICD-10-CA code?
No. O99 (Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 45 codes; record the one the documentation supports.
Where is O99 in ICD-10-CA?
O99 sits under O94-O99 Other obstetric conditions, not elsewhere classified, within Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99).
What coding notes apply to O99?
ICD-10-CA lists Note, Use additional code, Excludes notes for O99, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside O99
View O94-O99O94Sequelae of complication of pregnancy, childbirth and the puerperiumO95Obstetric death of unspecified causeO96Death from any obstetric cause occurring more than 42 days but less than one year after deliveryO97Death from sequelae of obstetric causesO98Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium