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ICD-10/O91.211

O91.211 ICD-10-CM Code: Nonpurulent mastitis associated with pregnancy, first trimester

O91.211 is the authoritative medical code for Nonpurulent mastitis associated with pregnancy, first trimester. This classification is used in medical billing and clinical recording to specify the clinical criteria for nonpurulent mastitis associated with pregnancy, first trimester (ICD-10-CM O91.211), ensuring healthcare documentation aligns with current federal coding standards.

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Nonpurulent mastitis associated with pregnancy, first trimester is a billable ICD-10-CM diagnosis code (O91.211). Excludes2 (not included here): mental and behavioral disorders associated with the puerperium (F53.-); obstetrical tetanus (A34); puerperal osteomalacia (M83.0). Use additional code: code to identify infection.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for O91.211 in the official ICD-10-CM tabular list.

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • puerperal osteomalacia (M83.0)

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code to identify infection

Frequently Asked Questions (FAQ) & Clinical Guidance

Can O91.211 be reported alongside related conditions?

Per official ICD-10-CM Excludes2 instructions, O91.211 and the following are not considered part of each other and may both be reported when both conditions are present: mental and behavioral disorders associated with the puerperium (F53.-); obstetrical tetanus (A34); puerperal osteomalacia (M83.0).

Is an additional code needed with O91.211?

Use additional code(s) to specify: code to identify infection.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to O91.211 in its code family, with their registry titles.

  • O91.119 — Abscess of breast associated with pregnancy, unspecified trimester
  • O91.12 — Abscess of breast associated with the puerperium
  • O91.13 — Abscess of breast associated with lactation
  • O91.2 — Nonpurulent mastitis associated with pregnancy, the puerperium and lactation
  • O91.21 — Nonpurulent mastitis associated with pregnancy
  • O91.212 — Nonpurulent mastitis associated with pregnancy, second trimester
  • O91.213 — Nonpurulent mastitis associated with pregnancy, third trimester
  • O91.219 — Nonpurulent mastitis associated with pregnancy, unspecified trimester
  • O91.22 — Nonpurulent mastitis associated with the puerperium
  • O91.23 — Nonpurulent mastitis associated with lactation

View all codes in the O91 family