O90.5 Postpartum thyroiditis

The ICD-10-CM code for Postpartum thyroiditis is O90.5 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

15: Pregnancy, childbirth and the puerperium (O00-O9A)

Section

O85-O92: Complications predominantly related to the puerperium (O85-O92)

Category O90

14 codes (11 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to O90.5:

• Puerperal, puerperium (complicated by, complications) › thyroiditis
• Thyroiditis › postpartum, puerperal

U.S. Hospital Utilization

• An estimated 145 U.S. inpatient stays in 2023 included O90.5 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)