O90.5 Postpartum thyroiditis

Billable ICD-10-CM code, FY2026.

MS-DRG index

Defines the logic of DRG(s) 769 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 648.12 Thyroid dysfunction of mother, delivered, with mention of postpartum complication (approximate)
• 648.14 Thyroid dysfunction of mother, postpartum condition or complication (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Code annotations containing back-references to O90.5

Back-references to O90.5

• Type 1 Excludes: E06 Thyroiditis ("postpartum thyroiditis (O90.5)")
• Type 2 Excludes: O99.2 Endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium ("postpartum thyroiditis (O90.5)")

Diagnosis Index entries for O90.5

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

Nearby codes

• O90.2 Hematoma of obstetric wound
• O90.3 Peripartum cardiomyopathy
• O90.4 Postpartum acute kidney failure
• O90.41 Hepatorenal syndrome following labor and delivery
• O90.49 Other postpartum acute kidney failure
• O90.5 Postpartum thyroiditis (this code)
• O90.6 Postpartum mood disturbance
• O90.8 Other complications of the puerperium, not elsewhere classified
• O90.81 Anemia of the puerperium
• O90.89 Other complications of the puerperium, not elsewhere classified
• O90.9 Complication of the puerperium, unspecified