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  2. ICD-10-CM Codes List
  3. Z00–Z99
  4. Z30-Z39
  5. Weeks of gestation (Z3A)

Weeks of gestation (Z3A)

The Z3A ICD-10 code section is used to specify the exact weeks of gestation during a pregnancy. These codes help record the precise stage of pregnancy, ranging from less than 8 weeks to greater than 42 weeks gestation.

This section includes detailed codes, such as Z3A.01 for pregnancies under 8 weeks, Z3A.19 for 19 weeks, up through Z3A.42 for 42 weeks, and beyond with Z3A.49 indicating greater than 42 weeks gestation. Coders can select specific codes that correlate with gestational age synonyms like “gestation period 10 weeks” or “gestation less than 20 weeks.” Notably, the Z3A.00 code covers unspecified gestational weeks and includes related fetal disorder conditions due to maternal health factors. These precise week-based codes are critical for documenting pregnancy progress in medical records, enabling appropriate prenatal care and monitoring. Understanding the ICD-10 code for weeks of gestation allows both healthcare professionals and coders to convey the pregnancy timeline accurately and consistently.

Instructional Notations

Code First

Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.

  • obstetric condition or encounter for delivery O09 O60 O80 O82

  • Codes from category Z3A are for use, only on the maternal record, to indicate the weeks of gestation of the pregnancy, if known.

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Hypercapnia

A clinical manifestation of abnormal increase in the amount of carbon dioxide in arterial blood.