O10 ICD-10-CA category: Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
O10 isn’t a code on its own. Choose one of the 30 codes beneath it, the one the documentation supports.
Official description
O10Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
ICD-10-CA · Canada
Codes in O10
O10 isn’t a code on its own. Open the group that matches what the note documents.
O10.0Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium (5 codes)O10.1Pre-existing hypertensive heart disease complicating pregnancy, childbirth and the puerperium (5 codes)O10.2Pre-existing hypertensive renal disease complicating pregnancy, childbirth and the puerperium (5 codes)O10.3Pre-existing hypertensive heart and renal disease complicating pregnancy, childbirth and the puerperium (5 codes)O10.4Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium (5 codes)O10.9Unspecified pre-existing hypertension complicating pregnancy, childbirth and the puerperium (5 codes)Notes for O10
As CIHI prints them, with any note O10 takes from the headings above it.
Includes
- The listed conditions with pre-existing proteinuria
Excludes
Conditions classified elsewhere.
- That with superimposed pre-eclampsia (O11)
- 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
- In order to satisfy the needs of the Canadian grouping methodology, appropriate codes in the range O10.0 to O99.8 will have a supplementary subclassification placed at the end of the code to identify the following:1 Delivered, with or without mention of antepartum conditionAntepartum condition with delivery, Delivery NOS, Intrapartum obstetric condition, Pregnancy delivered — with or without mention of antepartum or intrapartum complication during the current episode of care2 Delivered with mention of postpartumDelivery, Pregnancy, delivered — with mention of postpartum or puerperal complication during the current episode of care3 Antepartum condition or complicationAntepartum obstetric condition, not delivered during the current episode of care4 Postpartum condition or complicationPostpartum or puerperal obstetric condition or complication following delivery that occurred:• During previous episode of care• Outside hospital with subsequent admission for observation or care9 Unspecified as to episode of careFrom O10-O16 Oedema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium
- 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 O10 sits
- 1ChapterChapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
- 2Block O10-O16Oedema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium
- 3Category O10Pre-existing hypertension 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 O10 a valid ICD-10-CA code?
No. O10 (Pre-existing hypertension complicating pregnancy, childbirth and the puerperium) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 30 codes; record the one the documentation supports.
Where is O10 in ICD-10-CA?
O10 sits under O10-O16 Oedema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium, within Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99).
What coding notes apply to O10?
ICD-10-CA lists Includes, Excludes, Note notes for O10, 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.