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  6. 2026 ICD-10-CM Code O26.1

2026 ICD-10-CM Diagnosis Code O26.1

Low weight gain in pregnancy

ICD-10-CM Code:
O26.1
ICD-10 Code for:
Low weight gain in pregnancy
Is Billable?
Not Valid for Submission
Code Navigator:

O26.1 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of low weight gain in pregnancy. The code is not specific and is NOT valid for the year 2026 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.

Specific Coding Applicable to Low weight gain in pregnancy

Non-specific codes like O26.1 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for low weight gain in pregnancy:

  • Use O26.10 for Low weight gain in pregnancy, unspecified trimester - BILLABLE CODE

  • Use O26.11 for Low weight gain in pregnancy, first trimester - BILLABLE CODE

  • Use O26.12 for Low weight gain in pregnancy, second trimester - BILLABLE CODE

  • Use O26.13 for Low weight gain in pregnancy, third trimester - BILLABLE CODE

Code Classification

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

Clinical Information

  • Low Weight Gain in Pregnancy

    in a woman with a normal weight pre-pregnancy body mass index (bmi), i.e. 18.5-24.9, the weight gained during pregnancy does not exceed a total weight gain of 25 lbs. in a woman with an underweight pre-pregnancy body mass index (bmi), i.e. less than 18.5, the weight gained during pregnancy does not exceed a total weight gain of 28 lbs. in a woman with an overweight pre-pregnancy body mass index (bmi), i.e. 25.0-29.9, the weight gained during pregnancy does not exceed a total weight gain of 15 lbs. in a woman with an obese pre-pregnancy body mass index (bmi), i.e. greater than 30, the weight gained during pregnancy does not exceed a total weight gain of 11 lbs. these standards are supported for the whole population irrespective of height, race or ethnicity.

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Index of External Cause of Injuries

References found for this diagnosis code in the External Cause of Injuries Index:

    • Pregnancy(single) (uterine)
      • complicated by (care of) (management affected by)
        • insufficient
          • weight gain

Patient Education


Health Problems in Pregnancy

What are health problems in pregnancy?

A health problem in pregnancy is any disease or condition that could affect your health or the health of your fetus. Some health problems may make it more likely that you will have a high-risk pregnancy. A high-risk pregnancy is one in which you, your fetus, or both are at higher risk for health problems than in a typical pregnancy.

But just because you have health problems, it doesn't mean that you, or your fetus, will have a problem during the pregnancy. Taking care of yourself and getting early and regular prenatal care from a health care provider may help you reduce pregnancy risks from health problems.

What raises my risk for health problems during pregnancy?

Every pregnancy has some risk of problems, but your lifestyle, as well as factors like certain conditions and health issues, can raise that risk, such as:

  • A health condition you had before you got pregnant
  • A health condition you develop during pregnancy
  • A pregnancy with more than one baby
  • A health problem that happened during a previous pregnancy and could happen again
  • Substance use during pregnancy
  • Being over age 35

Any of these can affect your health, the health of your fetus, or both.

Can chronic health conditions cause problems in pregnancy?

Every pregnancy is different. If you have specific risks in one pregnancy, it doesn't mean that you will have them in another. But, if you have a chronic condition, you should talk to your 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 conditions that can complicate a pregnancy include:

  • High blood pressure
  • Polycystic ovary syndrome (PCOS)
  • Kidney problems
  • Autoimmune disorders
  • Thyroid disease
  • Obesity
  • HIV
  • Cancer
  • Infections

Other conditions that may make pregnancy risky can develop during pregnancy - for example, gestational diabetes and Rh incompatibility.

Can health problems in pregnancy be prevented?

You may be able to lower your risk of certain health problems by making healthy lifestyle changes before you get pregnant. These can include reaching a healthy weight, not smoking, and managing any health conditions.

However, health problems during pregnancy are not always preventable. Some chronic conditions can be treated and controlled, while others aren't treatable and carry a higher risk than usual, even if the health problem is well-managed.

Share your symptoms with your provider for early detection and treatment of health problems. Sometimes, it's hard to know what's normal. Some symptoms, like nausea, back pain, and fatigue, are common during pregnancy, while other symptoms, like vaginal bleeding or a severe or long-lasting headache, can be signs of a problem. Call your provider to let them know if something is bothering or worrying you.


[Learn More in MedlinePlus]

Code History

  • FY 2026 - No Change, effective from 10/1/2025 through 9/30/2026
  • FY 2025 - No Change, effective from 10/1/2024 through 9/30/2025
  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • 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. This was the first year ICD-10-CM was implemented into the HIPAA code set.