2021 ICD-10-CM Code O10.4

Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium

Version 2021
Non-Billable Code

Not Valid for Submission

O10.4 is a "header" nonspecific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium. The code is NOT valid for the year 2021 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

ICD-10:O10.4
Short Description:Pre-existing secondary hypertension compl preg/chldbrth
Long Description:Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium

Code Classification

Specific Coding for Pre-existing secondary hypertension compl preg/chldbrth

Header codes like O10.4 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for pre-existing secondary hypertension compl preg/chldbrth:

  • O10.41 - Pre-existing secondary hypertension complicating pregnancy
  • O10.411 - Pre-existing secondary hypertension complicating pregnancy, first trimester
  • O10.412 - Pre-existing secondary hypertension complicating pregnancy, second trimester
  • O10.413 - Pre-existing secondary hypertension complicating pregnancy, third trimester
  • O10.419 - Pre-existing secondary hypertension complicating pregnancy, unspecified trimester
  • O10.42 - Pre-existing secondary hypertension complicating childbirth
  • O10.43 - Pre-existing secondary hypertension complicating the puerperium

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code O10.4:


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.

Use Additional Code

Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.

Information for Patients


High Blood Pressure in Pregnancy

What is high blood pressure in pregnancy?

Blood pressure is the force of your blood pushing against the walls of your arteries as your heart pumps blood. High blood pressure, or hypertension, is when this force against your artery walls is too high. There are different types of high blood pressure in pregnancy:

What causes preeclampsia?

The cause of preeclampsia is not known.

Who is at risk for preeclampsia?

You are at higher risk of preeclampsia if you

What problems can preeclampsia cause?

Preeclampsia can cause

What are the symptoms of preeclampsia?

Possible symptoms of preeclampsia include


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Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)