ICD-10-CM 2027 diagnosis code

O10.41Pre-existing secondary hypertension complicating pregnancy

Not billable — use a more specific code

O10.41 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O10.41

O10.41 is the ICD-10-CM diagnosis code for pre-existing secondary hypertension complicating pregnancy. It belongs to category O10 (pre-existing hypertension complicating pregnancy, childbirth and the puerperium), block O10-O16 (edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within O10.4 (pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium), O10.41 is specifically for pre-existing secondary hypertension complicating pregnancy. Related codes cover childbirth (O10.42) and the puerperium (O10.43).

To report this condition, pick the subcode that matches the documentation: O10.411 (first trimester), O10.412 (second trimester), O10.413 (third trimester) and O10.419 (unspecified trimester).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under O10.41

Notes that apply from higher levels

Instructions written at a parent level also apply to O10.41.

› From O10.4 Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium

Use additional code

code from I15 to identify the type of secondary hypertension

› From O10 Pre-existing hypertension complicating pregnancy, childbirth and the puerperium

Includes

pre-existing hypertension with pre-existing proteinuria complicating pregnancy, childbirth and the puerperium

Excludes2

pre-existing hypertension with superimposed pre-eclampsia complicating pregnancy, childbirth and the puerperium (O11.-)

Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to O10.41.

Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic) › complicating › pregnancy › pre-existing › secondary

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about O10.41

Is O10.41 billable?: No. O10.41 is a header code. Report one of its more specific subcodes instead.