ICD10BillableValid for clinical use

ICD-10 Code O90.5: Postpartum thyroiditis

O90.5 is a billable ICD-10 diagnosis code used to classify Postpartum thyroiditis in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Pregnancy, childbirth and the puerperium (O00-O9A).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Pregnancy, childbirth and the puerperium (O00-O9A).

When is it used?

  • May be used when a clinician documents postpartum thyroiditis in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
15Pregnancy, childbirth and the puerperium (O00-O9A)
block
O85-O92Complications predominantly related to the puerperium
category
O90Complications of the puerperium, not elsewhere classified
currentO90

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

ObstetricianGynecologistEndocrinologist

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
O90.5

Common synonyms

Postpartum thyroiditis

Frequently asked questions

Code details

CodeO90.5
SystemICD10
Display namePostpartum thyroiditis
ChapterPregnancy, childbirth and the puerperium (O00-O9A)
BlockComplications predominantly related to the puerperium

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Puerperal, puerperium(complicated by, complications)Thyroiditis

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code O90.5 for Postpartum thyroiditis | HealthAssure