{"code":"O91","type":"category","title":"Infections of breast associated with pregnancy, the puerperium and lactation","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":[],"excludes2":["mental and behavioral disorders associated with the puerperium (F53.-)","obstetrical tetanus (A34)","puerperal osteomalacia (M83.0)"],"isBillable":false,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":false,"billableFy2027":false},"sibling_codes":["O91.0","O91.01","O91.011","O91.012","O91.013","O91.019","O91.02","O91.03","O91.1","O91.11","O91.111","O91.112","O91.113","O91.119","O91.12","O91.13","O91.2","O91.21","O91.211","O91.212","O91.213","O91.219","O91.22","O91.23"],"inclusionTerms":[],"sibling_titles":{"code":"O91.23","title":"Nonpurulent mastitis associated with lactation","isBillable":true},"useAdditionalCode":["code to identify infection"],"clinicalDefinition":"Infections of breast associated with pregnancy, the puerperium and lactation is a non-billable ICD-10-CM category code (O91). A more specific billable subcode must be selected for claims submission. 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.","officialDefinition":"Infections of breast associated with pregnancy, the puerperium and lactation is a non-billable ICD-10-CM category code (O91). A more specific billable subcode must be selected for claims submission. 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.","seventhCharacterInstructions":[],"workflowProtocols":[],"guidelines":{"whenToUse":[],"whenNotToUse":[],"commonBillingMistakes":[],"codeComparisons":[],"documentationChecklist":[]},"domainLandscape":{"summary":"Primary diagnostic domain and clinical landscape evaluation.","keyCategories":[],"diagnosticContinuum":"Progression continuum from acute presentation to resolution."},"children":[{"code":"O91.0","title":"Infection of nipple associated with pregnancy, the puerperium and lactation","description":"Infection of nipple associated with pregnancy, the puerperium and lactation is a non-billable ICD-10-CM category code (O91.0). A more specific billable subcode must be selected for claims submission. 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.","isBillable":false,"slug":"o91.0-infection-of-nipple-associated-with-pregnancy-the-puerperium-and-lactation"},{"code":"O91.01","title":"Infection of nipple associated with pregnancy","description":"Infection of nipple associated with pregnancy is a non-billable ICD-10-CM category code (O91.01). A more specific billable subcode must be selected for claims submission. Inclusion terms: Gestational abscess of nipple. 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.","isBillable":false,"slug":"o91.01-infection-of-nipple-associated-with-pregnancy"},{"code":"O91.011","title":"Infection of nipple associated with pregnancy, first trimester","description":"Infection of nipple associated with pregnancy, first trimester is a billable ICD-10-CM diagnosis code (O91.011). 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.","isBillable":true,"slug":"o91.011-infection-of-nipple-associated-with-pregnancy-first-trimester"},{"code":"O91.012","title":"Infection of nipple associated with pregnancy, second trimester","description":"Infection of nipple associated with pregnancy, second trimester is a billable ICD-10-CM diagnosis code (O91.012). 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.","isBillable":true,"slug":"o91.012-infection-of-nipple-associated-with-pregnancy-second-trimester"},{"code":"O91.013","title":"Infection of nipple associated with pregnancy, third trimester","description":"Infection of nipple associated with pregnancy, third trimester is a billable ICD-10-CM diagnosis code (O91.013). 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.","isBillable":true,"slug":"o91.013-infection-of-nipple-associated-with-pregnancy-third-trimester"},{"code":"O91.019","title":"Infection of nipple associated with pregnancy, unspecified trimester","description":"Infection of nipple associated with pregnancy, unspecified trimester is a billable ICD-10-CM diagnosis code (O91.019). 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.","isBillable":true,"slug":"o91.019-infection-of-nipple-associated-with-pregnancy-unspecified-trimester"},{"code":"O91.02","title":"Infection of nipple associated with the puerperium","description":"Infection of nipple associated with the puerperium is a billable ICD-10-CM diagnosis code (O91.02). Inclusion terms: Puerperal abscess of nipple. 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.","isBillable":true,"slug":"o91.02-infection-of-nipple-associated-with-the-puerperium"},{"code":"O91.03","title":"Infection of nipple associated with lactation","description":"Infection of nipple associated with lactation is a billable ICD-10-CM diagnosis code (O91.03). Inclusion terms: Abscess of nipple associated with lactation. 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.","isBillable":true,"slug":"o91.03-infection-of-nipple-associated-with-lactation"},{"code":"O91.1","title":"Abscess of breast associated with pregnancy, the puerperium and lactation","description":"Abscess of breast associated with pregnancy, the puerperium and lactation is a non-billable ICD-10-CM category code (O91.1). A more specific billable subcode must be selected for claims submission. 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.","isBillable":false,"slug":"o91.1-abscess-of-breast-associated-with-pregnancy-the-puerperium-and-lactation"},{"code":"O91.11","title":"Abscess of breast associated with pregnancy","description":"Abscess of breast associated with pregnancy is a non-billable ICD-10-CM category code (O91.11). A more specific billable subcode must be selected for claims submission. Inclusion terms: Gestational mammary abscess; Gestational purulent mastitis; Gestational subareolar abscess. 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.","isBillable":false,"slug":"o91.11-abscess-of-breast-associated-with-pregnancy"},{"code":"O91.111","title":"Abscess of breast associated with pregnancy, first trimester","description":"Abscess of breast associated with pregnancy, first trimester is a billable ICD-10-CM diagnosis code (O91.111). 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.","isBillable":true,"slug":"o91.111-abscess-of-breast-associated-with-pregnancy-first-trimester"},{"code":"O91.112","title":"Abscess of breast associated with pregnancy, second trimester","description":"Abscess of breast associated with pregnancy, second trimester is a billable ICD-10-CM diagnosis code (O91.112). 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.","isBillable":true,"slug":"o91.112-abscess-of-breast-associated-with-pregnancy-second-trimester"},{"code":"O91.113","title":"Abscess of breast associated with pregnancy, third trimester","description":"Abscess of breast associated with pregnancy, third trimester is a billable ICD-10-CM diagnosis code (O91.113). 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.","isBillable":true,"slug":"o91.113-abscess-of-breast-associated-with-pregnancy-third-trimester"},{"code":"O91.119","title":"Abscess of breast associated with pregnancy, unspecified trimester","description":"Abscess of breast associated with pregnancy, unspecified trimester is a billable ICD-10-CM diagnosis code (O91.119). 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.","isBillable":true,"slug":"o91.119-abscess-of-breast-associated-with-pregnancy-unspecified-trimester"},{"code":"O91.12","title":"Abscess of breast associated with the puerperium","description":"Abscess of breast associated with the puerperium is a billable ICD-10-CM diagnosis code (O91.12). Inclusion terms: Puerperal mammary abscess; Puerperal purulent mastitis; Puerperal subareolar abscess. 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.","isBillable":true,"slug":"o91.12-abscess-of-breast-associated-with-the-puerperium"},{"code":"O91.13","title":"Abscess of breast associated with lactation","description":"Abscess of breast associated with lactation is a billable ICD-10-CM diagnosis code (O91.13). Inclusion terms: Mammary abscess associated with lactation; Purulent mastitis associated with lactation; Subareolar abscess associated with lactation. 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.","isBillable":true,"slug":"o91.13-abscess-of-breast-associated-with-lactation"},{"code":"O91.2","title":"Nonpurulent mastitis associated with pregnancy, the puerperium and lactation","description":"Nonpurulent mastitis associated with pregnancy, the puerperium and lactation is a non-billable ICD-10-CM category code (O91.2). A more specific billable subcode must be selected for claims submission. 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.","isBillable":false,"slug":"o91.2-nonpurulent-mastitis-associated-with-pregnancy-the-puerperium-and-lactation"},{"code":"O91.21","title":"Nonpurulent mastitis associated with pregnancy","description":"Nonpurulent mastitis associated with pregnancy is a non-billable ICD-10-CM category code (O91.21). A more specific billable subcode must be selected for claims submission. Inclusion terms: Gestational interstitial mastitis; Gestational lymphangitis of breast; Gestational mastitis NOS; Gestational parenchymatous mastitis. 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.","isBillable":false,"slug":"o91.21-nonpurulent-mastitis-associated-with-pregnancy"},{"code":"O91.211","title":"Nonpurulent mastitis associated with pregnancy, first trimester","description":"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.","isBillable":true,"slug":"o91.211-nonpurulent-mastitis-associated-with-pregnancy-first-trimester"},{"code":"O91.212","title":"Nonpurulent mastitis associated with pregnancy, second trimester","description":"Nonpurulent mastitis associated with pregnancy, second trimester is a billable ICD-10-CM diagnosis code (O91.212). 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.","isBillable":true,"slug":"o91.212-nonpurulent-mastitis-associated-with-pregnancy-second-trimester"},{"code":"O91.213","title":"Nonpurulent mastitis associated with pregnancy, third trimester","description":"Nonpurulent mastitis associated with pregnancy, third trimester is a billable ICD-10-CM diagnosis code (O91.213). 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.","isBillable":true,"slug":"o91.213-nonpurulent-mastitis-associated-with-pregnancy-third-trimester"},{"code":"O91.219","title":"Nonpurulent mastitis associated with pregnancy, unspecified trimester","description":"Nonpurulent mastitis associated with pregnancy, unspecified trimester is a billable ICD-10-CM diagnosis code (O91.219). 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.","isBillable":true,"slug":"o91.219-nonpurulent-mastitis-associated-with-pregnancy-unspecified-trimester"},{"code":"O91.22","title":"Nonpurulent mastitis associated with the puerperium","description":"Nonpurulent mastitis associated with the puerperium is a billable ICD-10-CM diagnosis code (O91.22). Inclusion terms: Puerperal interstitial mastitis; Puerperal lymphangitis of breast; Puerperal mastitis NOS; Puerperal parenchymatous mastitis. 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.","isBillable":true,"slug":"o91.22-nonpurulent-mastitis-associated-with-the-puerperium"},{"code":"O91.23","title":"Nonpurulent mastitis associated with lactation","description":"Nonpurulent mastitis associated with lactation is a billable ICD-10-CM diagnosis code (O91.23). Inclusion terms: Interstitial mastitis associated with lactation; Lymphangitis of breast associated with lactation; Mastitis NOS associated with lactation; Parenchymatous mastitis associated with lactation. 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.","isBillable":true,"slug":"o91.23-nonpurulent-mastitis-associated-with-lactation"}],"hierarchy":[],"relatedCodes":[],"relevantCPTCodes":[],"documentationTips":[],"caseStudies":[],"description":"","overview":""}