O26.01 - Excessive weight gain in pregnancy, first trimester

Version 2023
First Trimester (0 to 13 Weeks)
ICD-10:O26.01
Short Description:Excessive weight gain in pregnancy, first trimester
Long Description:Excessive weight gain in pregnancy, first trimester
Status: Valid for Submission
Version:ICD-10-CM 2023
Code Classification:
  • Pregnancy, childbirth and the puerperium (O00–O99)
    • Other maternal disorders predominantly related to pregnancy (O20-O29)
      • Maternal care for oth conditions predom related to pregnancy (O26)

O26.01 is a billable ICD-10 code used to specify a medical diagnosis of excessive weight gain in pregnancy, first trimester. The code is valid during the fiscal year 2023 from October 01, 2022 through September 30, 2023 for the submission of HIPAA-covered transactions.

The code O26.01 is applicable to female patients aged 12 through 55 years inclusive. It is clinically and virtually impossible to use this code on a non-female patient outside the stated age range.

The code is commonly used in ob/gyn medical specialties to specify clinical concepts such as maternal disorders related to pregnancy.

Clinical Information

Code Edits

The Medicare Code Editor (MCE) detects and reports errors in the coding of claims data. The following ICD-10 Code Edits are applicable to this code:

Convert to ICD-9 Code

Source ICD-10 CodeTarget ICD-9 Code
O26.01646.11 - Edema in preg-delivered
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.
O26.01646.13 - Edema in preg-antepartum
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education


Health Problems in Pregnancy

Every pregnancy has some risk of problems. You may have problems because of a health condition you had before you got pregnant. You could also develop a condition during pregnancy. Other causes of problems during pregnancy can include being pregnant with more than one baby, a health problem in a previous pregnancy, drug use during pregnancy, or being over age 35. Any of these can affect your health, the health of your baby, or both.

If you have a chronic condition, you should talk to your health care provider about how to minimize your risk before you get pregnant. Once you are pregnant, you may need a health care team to monitor your pregnancy. Some common health problems that can complicate a pregnancy include:

Other conditions that can make pregnancy risky can happen while you are pregnant - for example, gestational diabetes and Rh incompatibility. Good prenatal care can help detect and treat them.

Some discomforts, like nausea, back pain, and fatigue, are common during pregnancy. Sometimes it is hard to know what is normal. Call your health care provider if something is bothering or worrying you.


[Learn More in MedlinePlus]

Code History