O10.009 ICD-10-CA code: Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium, unspecified as to episode of care, or not applicable
O10.009 is the ICD-10-CA code for “Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium, unspecified as to episode of care, or not applicable” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
O10.009Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium, unspecified as to episode of care, or not applicable
Short description: Px essent H/T preg bir puer/unspecified
ICD-10-CA · Canada · Also written O10009
Notes for O10.009
As CIHI prints them, with any note O10.009 takes from the headings above it.
Includes
- • Any condition in I10.- specified as a reason for obstetric care during pregnancy, childbirth or the puerperiumFrom O10.0 Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium
- The listed conditions with pre-existing proteinuriaFrom O10 Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
Excludes
Conditions classified elsewhere.
- That with superimposed pre-eclampsia (O11)From O10 Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
- 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 O10.009 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
- 4Subcategory O10.0Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium
- 5Valid code O10.009Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium, unspecified as to episode of care, or not applicable
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
What does ICD-10-CA code O10.009 mean?
O10.009 is the ICD-10-CA code for “Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium, unspecified as to episode of care, or not applicable” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is O10.009 in ICD-10-CA?
O10.009 sits under O10.0 Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium, within O10 Pre-existing hypertension complicating pregnancy, childbirth and the puerperium, within 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 O10.009?
ICD-10-CA lists Includes, Excludes, Note notes for O10.009, 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 O10.009
View O10.0O10.001Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium, delivered, with or without mention of antepartum conditionO10.002Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium, delivered, with mention of postpartum complicationO10.003Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium, antepartum condition or complicationO10.004Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium, postpartum condition or complication