ICD-10-CM Codes
O00-O9A Pregnancy, childbirth and the puerperium
O20-O29 Other maternal disorders predominantly related to pregnancy
O26- Maternal care for other conditions predominantly related to pregnancy

2018 ICD-10-CM Diagnosis Code O26.40

Herpes gestationis, unspecified trimester

2016

2017

2018

Billable/Specific Code

Maternity Dx (12-55 years)

Female Dx

O26.40 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
The 2018 edition of ICD-10-CM O26.40 became effective on October 1, 2017.
This is the American ICD-10-CM version of O26.40 - other international versions of ICD-10 O26.40 may differ.

ICD-10-CM Coding Rules

O26.40 is applicable to maternity patients aged 12 - 55 years inclusive.
O26.40 is applicable to female patients.

The following code(s) above O26.40 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 O26.40:

O00-O9A
2018 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
O20-O29
2018 ICD-10-CM Range O20-O29
Other maternal disorders predominantly related to pregnancy
Type 2 Excludes
- maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
- maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium (O98-O99)
Other maternal disorders predominantly related to pregnancy

Approximate Synonyms

Herpes gestationis
Herpes gestationis in pregnancy

Clinical Information

A rare autoimmune bullous dermatitis that develops during pregnancy, most often during the second and third trimesters.
An itching, autoimmune, bullous skin disease that occurs during the last two trimesters of pregnancy and puerperium. It also affects non-pregnant females with tissue of placenta origin, such as choriocarcinoma; or hydatidiform mole. It exhibits antigenic and clinical similarity to bullous pemphigoid (pemphigoid, bullous). This disease does not involve herpes viruses (old name, herpes gestationis).

ICD-10-CM O26.40 is grouped within Diagnostic Related Group(s) (MS-DRG v35.0):

781 Other antepartum diagnoses with medical complications

Convert O26.40 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

ICD-10-CM Codes Adjacent To O26.40

O26.20 …… unspecified trimester

O26.21 …… first trimester

O26.22 …… second trimester

O26.23 …… third trimester

O26.3 Retained intrauterine contraceptive device in pregnancy

O26.30 …… unspecified trimester

O26.31 …… first trimester

O26.32 …… second trimester

O26.33 …… third trimester

O26.4 Herpes gestationis

O26.40 …… unspecified trimester

O26.41 …… first trimester

O26.42 …… second trimester

O26.43 …… third trimester

O26.5 Maternal hypotension syndrome

O26.50 …… unspecified trimester

O26.51 …… first trimester

O26.52 …… second trimester

O26.53 …… third trimester

O26.6 Liver and biliary tract disorders in pregnancy, childbirth and the puerperium

O26.61 Liver and biliary tract disorders in pregnancy

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

2018 ICD-10-CM Diagnosis Code O26.40

Herpes gestationis, unspecified trimester

Pregnancy, childbirth and the puerperium

Other maternal disorders predominantly related to pregnancy