You can use diagnosis codes for any of the following clinical situations to report a diagnostic PSA (84153, Prostate specific antigen; total), as seen in the National Coverage Determinations ICD9 Codes Covered list:
185 Malignant neoplasm of prostate
188.5 Malignant neoplasm of bladder neck
196.5 Secondary and unspecified malignant neoplasm of lymph nodes; lymph nodes of inguinal region and lower limb
196.6 ... intrapelvic lymph nodes
196.8 ... lymph nodes of multiple sites
198.5 Secondary malignant neoplasm; bone and bone marrow
198.82 ... genital organs
233.4 Carcinoma in situ, prostate
236.5 Neoplasm of uncertain behavior of prostate
239.5 Neoplasms of unspecified nature, other genitourinary organs
596.0 Bladder neck obstruction
599.6 Urinary obstruction, unspecified
599.7 Hematuria
601.9 Prostatitis, unspecified
602.9 Unspecified disorder of prostate
788.20 Retention of urine, unspecified
788.21 Incomplete bladder emptying
788.30 Urinary incontinence, unspecified
788.41 Urinary frequency
788.43 Nocturia
788.62 Slowing of urinary stream
790.93 Elevated prostate specific antigen (PSA)
793.6-793.7 Nonspecific abnormal findings on radiological and other examination of body structure
794.9 Nonspecific abnormal results of function studies, other
V10.46 Personal history of malignant neoplasm; prostate.