ICD-10 Diagnosis Code O23.521

Salpingo-oophoritis in pregnancy, first trimester

Diagnosis Code O23.521

ICD-10: O23.521
Short Description: Salpingo-oophoritis in pregnancy, first trimester
Long Description: Salpingo-oophoritis in pregnancy, first trimester
This is the 2019 version of the ICD-10-CM diagnosis code O23.521

Valid for Submission
The code O23.521 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Pregnancy, childbirth and the puerperium (O00–O99)
    • Other maternal disorders predominantly related to pregnancy (O20-O29)
      • Infections of genitourinary tract in pregnancy (O23)


Version 2019 Billable Code Maternity Diagnoses Diagnoses For Females Only

Information for Medical Professionals


Code Edits
The following edits are applicable to this code:
Maternity diagnoses - Maternity. Age range is 12–55 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).
Diagnoses for females only - Diagnoses for females only.

Diagnostic Related Groups
The diagnosis code O23.521 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)

  • 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

Convert to ICD-9
  • 646.61 - Gu infection-delivered (Approximate Flag)
  • 646.63 - Gu infection-antepartum (Approximate Flag)

Information for Patients


Infections and Pregnancy

During pregnancy, some common infections like the common cold or a skin infection do not usually cause serious problems. But other infections can be dangerous to you, your baby, or both. Some infections may lead to preterm birth and low birth weight babies. Others can cause serious illness, birth defects, and lifelong disabilities, such as hearing loss or learning problems.

Some of the infections that can be dangerous during pregnancy include

  • Bacterial vaginosis (BV)
  • Group B strep (GBS)
  • Hepatitis
  • Sexually transmitted diseases
  • Toxoplasmosis
  • Urinary tract infections
  • Yeast infections
  • Zika virus

To try to prevent infections,

  • Don't eat raw or undercooked meat
  • Don't share food or drinks with other people
  • Wash your hands frequently
  • Don't empty cat litter. Cats can transmit toxoplasmosis.

If you do get an infection during pregnancy, contact your health care provider about how best to protect you and your baby. Only some medicines are safe during pregnancy.

  • Group B streptococcal septicemia of the newborn (Medical Encyclopedia)
  • Group B streptococcus - pregnancy (Medical Encyclopedia)
  • Immunization and Pregnancy (Centers for Disease Control and Prevention)
  • Pregnancy and the flu (Medical Encyclopedia)
  • Pregnant Women Need a Flu Shot (Centers for Disease Control and Prevention)
  • Protect Your Baby for Life: When a Pregnant Woman Has Hepatitis B (Centers for Disease Control and Prevention)
  • Toxoplasmosis: An Important Message for Women (Centers for Disease Control and Prevention)

[Read More]

Pelvic Inflammatory Disease

Also called: PID

Pelvic inflammatory disease (PID) is an infection and inflammation of the uterus, ovaries, and other female reproductive organs. It causes scarring in these organs. This can lead to infertility, ectopic pregnancy, pelvic pain, abscesses, and other serious problems. PID is the most common preventable cause of infertility in the United States.

Gonorrhea and chlamydia, two sexually transmitted diseases, are the most common causes of PID. Other bacteria can also cause it. You are at greater risk if you

  • Are sexually active and younger than 25
  • Have more than one sex partner
  • Douche

Some women have no symptoms. Others have pain in the lower abdomen, fever, smelly vaginal discharge, irregular bleeding, and pain during intercourse or urination. Doctors diagnose PID with a physical exam, lab tests, and imaging tests. Antibiotics can cure PID. Early treatment is important. Waiting too long increases the risk of infertility.

NIH: National Institute of Allergy and Infectious Diseases

  • Pelvic Inflammatory Disease (PID) (Centers for Disease Control and Prevention)
  • Pelvic inflammatory disease (PID) (Medical Encyclopedia)
  • Pelvic inflammatory disease (PID) -- aftercare (Medical Encyclopedia)

[Read More]

ICD-10 Footnotes

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.

Present on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

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