-- O29.40 Spinal and epidural anesthesia induced headache during pregnancy, unspecified trimester

-- O29.41 Spinal and epidural anesthesia induced headache during pregnancy, first trimester

-- O29.42 Spinal and epidural anesthesia induced headache during pregnancy, second trimester

-- O29.43 Spinal and epidural anesthesia induced headache during pregnancy, third trimester