ICD-10-CM Codes
O00-O9A Pregnancy, childbirth and the puerperium
O10-O16 Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium
O11- Pre-existing hypertension with pre-eclampsia

2020 ICD-10-CM Diagnosis Code O11.9

Pre-existing hypertension with pre-eclampsia, unspecified trimester

2016

2017

2018

2019

2020

Billable/Specific Code

Maternity Dx (12-55 years)

O11.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Short description: Pre-existing hypertension with pre-eclampsia, unsp trimester
The 2020 edition of ICD-10-CM O11.9 became effective on October 1, 2019.
This is the American ICD-10-CM version of O11.9 - other international versions of ICD-10 O11.9 may differ.

ICD-10-CM Coding Rules

O11.9 is applicable to maternity patients aged 12 - 55 years inclusive.

The following code(s) above O11.9 contain annotation back-references

Annotation Back-References

In this context, annotation back-references refer to codes that contain:

Applicable To annotations, or
Code Also annotations, or
Code First annotations, or
Excludes1 annotations, or
Excludes2 annotations, or
Includes annotations, or
Note annotations, or
Use Additional annotations

that may be applicable to O11.9:

O00-O9A
2020 ICD-10-CM Range O00-O9A
Pregnancy, childbirth and the puerperium
Note
- CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
- Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
- Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
- 1st trimester- less than 14 weeks 0 days
- 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
- 3rd trimester- 28 weeks 0 days until delivery
Type 1 Excludes
- supervision of normal pregnancy (Z34.-)
Type 2 Excludes
- mental and behavioral disorders associated with the puerperium (F53.-)
- obstetrical tetanus (A34)
- postpartum necrosis of pituitary gland (E23.0)
- puerperal osteomalacia (M83.0)
Use Additional
- code from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Pregnancy, childbirth and the puerperium
O11
ICD-10-CM Diagnosis Code O11
Pre-existing hypertension with pre-eclampsia
Includes
- conditions in Ol0 complicated by pre-eclampsia
- pre-eclampsia superimposed pre-existing hypertension
Use Additional
- code from O10 to identify the type of hypertension
Pre-existing hypertension with pre-eclampsia

Approximate Synonyms

Pre-eclampsia added to pre-existing hypertension
Preeclampsia with preexisting hypertension

ICD-10-CM O11.9 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):

817 Other antepartum diagnoses with o.r. Procedure with mcc
818 Other antepartum diagnoses with o.r. Procedure with cc
819 Other antepartum diagnoses with o.r. Procedure without cc/mcc
831 Other antepartum diagnoses without o.r. Procedure with mcc
832 Other antepartum diagnoses without o.r. Procedure with cc
833 Other antepartum diagnoses without o.r. Procedure without cc/mcc

Convert O11.9 to ICD-9-CM

Code History

2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
2017 (effective 10/1/2016): No change
2018 (effective 10/1/2017): No change
2019 (effective 10/1/2018): No change
2020 (effective 10/1/2019): No change

ICD-10-CM Codes Adjacent To O11.9

O10.913 …… third trimester

O10.919 …… unspecified trimester

O10.92 Unspecified pre-existing hypertension complicating childbirth

O10.93 Unspecified pre-existing hypertension complicating the puerperium

O11 Pre-existing hypertension with pre-eclampsia

O11.1 Pre-existing hypertension with pre-eclampsia, first trimester

O11.2 Pre-existing hypertension with pre-eclampsia, second trimester

O11.3 Pre-existing hypertension with pre-eclampsia, third trimester

O11.4 Pre-existing hypertension with pre-eclampsia, complicating childbirth

O11.5 Pre-existing hypertension with pre-eclampsia, complicating the puerperium

O11.9 Pre-existing hypertension with pre-eclampsia, unspecified trimester

O12 Gestational [pregnancy-induced] edema and proteinuria without hypertension

O12.0 Gestational edema

O12.00 …… unspecified trimester

O12.01 …… first trimester

O12.02 …… second trimester

O12.03 …… third trimester

O12.04 …… complicating childbirth

O12.05 …… complicating the puerperium

O12.1 Gestational proteinuria

O12.10 …… unspecified trimester

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

2020 ICD-10-CM Diagnosis Code O11.9

Pre-existing hypertension with pre-eclampsia, unspecified trimester

Pregnancy, childbirth and the puerperium

Pre-existing hypertension with pre-eclampsia