E06.5 Other chronic thyroiditis

Billable ICD-10-CM code, FY2026.

Applicable to

• Chronic fibrous thyroiditis
• Chronic thyroiditis NOS
• Ligneous thyroiditis
• Riedel thyroiditis

Applies from E06 Thyroiditis

Excludes1 (never code together)

• postpartum thyroiditis (O90.5)

Risk adjustment (HCC)

• RxHCC V08: HCC 44 — Thyroid Disorders

MS-DRG index

Defines the logic of DRG(s) 011-013 in MDC PRE.

Approximate ICD-9-CM (GEMs)

• 245.3 Chronic fibrous thyroiditis (approximate)
• 245.8 Other and unspecified chronic thyroiditis (approximate)

Code annotations containing back-references to E06.5

Back-references to E06

• Code First: G63 Polyneuropathy in diseases classified elsewhere ("endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34)")

Diagnosis Index entries for E06.5

• Ligneous thyroiditis
• Riedel's › struma, thyroiditis or disease
• Struma › Riedel's
• Thyroiditis › chronic (nonspecific) (sclerosing)
• Thyroiditis › chronic (nonspecific) (sclerosing) › fibrous
• Thyroiditis › fibrous (chronic)
• Thyroiditis › ligneous
• Thyroiditis › Riedel's
• Thyroiditis › woody

Nearby codes

• E06.0 Acute thyroiditis
• E06.1 Subacute thyroiditis
• E06.2 Chronic thyroiditis with transient thyrotoxicosis
• E06.3 Autoimmune thyroiditis
• E06.4 Drug-induced thyroiditis
• E06.5 Other chronic thyroiditis (this code)
• E06.9 Thyroiditis, unspecified