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O24.504 ICD-10-CA code: Pre-existing type 1 diabetes mellitus in pregnancy postpartum condition or complication

O24.504 is the ICD-10-CA code for “Pre-existing type 1 diabetes mellitus in pregnancy postpartum condition or complication” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

O24.504

Pre-existing type 1 diabetes mellitus in pregnancy postpartum condition or complication

Short description: Type 1 DM preg w postpart comp

ICD-10-CA · Canada · Also written O24504

Notes for O24.504

As CIHI prints them, with any note O24.504 takes from the headings above it.

Includes

Use additional code

Add a code for this detail when the note documents it.

Excludes

Conditions classified elsewhere.

  • Maternal:• care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)• diseases classifiable elsewhere but complicating pregnancy, labour and delivery, and the puerperium (O98-O99)From O20-O29 Other maternal disorders predominantly related to pregnancy
  • 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

  • An additional code from the range of E10 - E14 may also be selected to further specify any existing complication of diabetes.From O24 Diabetes mellitus in pregnancy
  • Categories O24.- and O25.- include the listed conditions even if they occur during childbirth or the puerperium.From O20-O29 Other maternal disorders predominantly related to pregnancy
  • 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 O24.504 sits

  1. 1ChapterChapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
  2. 2Block O20-O29Other maternal disorders predominantly related to pregnancy
  3. 3Category O24Diabetes mellitus in pregnancy
  4. 4Subcategory O24.5Pre-existing type 1 diabetes mellitus in pregnancy
  5. 5Valid code O24.504Pre-existing type 1 diabetes mellitus in pregnancy postpartum condition or complication

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.

See O24.504 in the CIHI source

Frequently asked questions

What does ICD-10-CA code O24.504 mean?

O24.504 is the ICD-10-CA code for “Pre-existing type 1 diabetes mellitus in pregnancy postpartum condition or complication” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is O24.504 in ICD-10-CA?

O24.504 sits under O24.5 Pre-existing type 1 diabetes mellitus in pregnancy, within O24 Diabetes mellitus in pregnancy, within O20-O29 Other maternal disorders predominantly related to pregnancy, within Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99).

What coding notes apply to O24.504?

ICD-10-CA lists Includes, Note, Use additional code, Excludes notes for O24.504, 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 O24.504

O24.501Pre-existing type 1 diabetes mellitus in pregnancy delivered with or without mention of antepartum conditionO24.502Pre-existing type 1 diabetes mellitus in pregnancy delivered with mention of postpartum complicationO24.503Pre-existing type 1 diabetes mellitus in pregnancy antepartum condition or complicationO24.509Pre-existing type 1 diabetes mellitus in pregnancy unspecified as to episode of care or not applicable