Pregnancy-Related Clinical Codes in Unlikely Populations in Primary Care - Summary - MDSpire

Pregnancy-Related Clinical Codes in Unlikely Populations in Primary Care

  • By

  • Helen Curtis

  • Peter Inglesby

  • Ben Goldacre

  • Rose Higgins

  • Amir Mehrkar

  • Sebastian Bacon

  • Brian MacKenna

  • June 30, 2026

  • 0 min

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Objective:

To investigate the occurrence of pregnancy-related clinical codes in male patients and older females in primary care settings during the COVID-19 vaccination period, specifically focusing on the use of these codes in relation to vaccine eligibility.

Approach:
  • Data Collection: Counted patients with SNOMED CT codes indicative of pregnancies and births, including specific codes related to pregnancy, delivery, and fetal presentations, recorded between January 2020 and March 2021.
Key Findings:
  • 0.1 to 0.4 per 1000 male patients had recent pregnancy/delivery codes, highest in TPP practices, with the most common code being 'knee presentation,' which is not explicitly related to delivery.
  • Up to 0.5 per 1000 registered females aged 70+ had recent pregnancy or birth codes.
Interpretation:

The findings suggest potential inaccuracies in clinical coding practices, particularly regarding pregnancy-related codes in non-pregnant populations.

Limitations:
  • The study may not account for all possible reasons for the presence of pregnancy codes in males and older females, including potential misclassification or coding errors.
  • The analysis is limited to the top 10 codes per age/sex group and may not represent all occurrences, potentially underestimating the prevalence of pregnancy-related codes.
Conclusion:

Clinical codes may not always accurately reflect the expected condition, highlighting the need for careful verification by secondary users of clinical data.

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