AAPC COC Course Notes

Outpatient uncertain diagnoses (probable, suspected, possible, rule out) are not coded as confirmed; report symptoms/signs or other established findings. First-listed diagnosis = condition chiefly responsible for the outpatient services provided after study; code to the highest degree of certainty. Signs/symptoms integral to a confirmed diagnosis generally are not separately coded; nonintegral clinically significant symptoms may be. Screening = testing an apparently well person; diagnostic testing is prompted by a sign, symptom, abnormal finding, or known condition. Follow-up after completed treatment is different from active disease; when malignancy is eradicated and treatment is complete, use follow-up/history concepts as supported.

• Coding 'possible/probable/suspected/rule out' diagnoses as confirmed in the outpatient setting.

• AAPC estimates 15 ICD-10-CM questions; prioritize outpatient guidelines, sequencing, specificity, combination codes, and documentation.

Use the current CPT book for code definitions; use CMS/NCCI to understand outpatient edits and bundling. 47562 = laparoscopic cholecystectomy without cholangiography; 47563 = laparoscopic cholecystectomy with cholangiography. Code the approach actually performed: open and laparoscopic services are different code families. Common colonoscopy anchors: 45378 diagnostic, 45380 biopsy, 45385 snare removal. Multiple techniques on distinct lesions may be separately reportable only when NCCI permits. Common EGD anchors: 43235 diagnostic and 43239 with biopsy.

• Choosing by procedure name while missing approach, technique, contrast, tissue depth, number of views, or timed minutes.

• CPT mechanics also feed AAPC's heavily weighted Surgery and Modifiers section; prioritize operative detail, technique, bundling, modifiers, time, and code-family distinctions.

PAP equipment: E0601 CPAP; E0470 bilevel without backup rate; E0471 bilevel with backup rate. PAP supplies: A7030 full-face mask, A7034 nasal interface, A7035 headgear, A7037 tubing, A7038 disposable filter. Ambulance: A0428 BLS nonemergency, A0429 BLS emergency, A0425 ground mileage, A0430 fixed-wing, A0431 rotary-wing. Drug-unit math comes from the HCPCS descriptor: administered amount ÷ descriptor amount per unit. J1885 ketorolac = 15 mg/unit; 30 mg = 2 units.

• Guessing a drug unit from vial count instead of the HCPCS descriptor.

• AAPC estimates 7 HCPCS Level II questions; focus on equipment/supply identity, drug units, ambulance codes, and Medicare modifiers.

Hospital outpatient facility payment commonly uses OPPS/APCs; ASC and CAH payment systems differ. APCs are outpatient payment groups based mainly on services/resources—not diagnosis-based severity groups. Use the Addendum B effective for the date of service; CMS updates OPPS quarterly. Status N = packaged/no separate OPPS payment, not automatically noncovered. J1 = comprehensive APC primary service; J2 = comprehensive observation logic.

• Treating OPPS, ASC, CAH, and IPPS payment methodologies as interchangeable.

• AAPC estimates 13 Payment Methodologies questions; know OPPS/APCs, status indicators, packaging, claim formats, and date-of-service updates.

Never add a service that was not performed or supported; knowingly false billing can create False Claims Act exposure. Upcoding = unsupported higher-level reporting; unbundling = improperly splitting a comprehensive service. When a credible overpayment is identified, investigate, quantify, correct, and timely report/return it under current CMS rules. ABNs are prospective and specific: issue a valid required ABN before the service when Medicare is expected to deny in an applicable circumstance. Do not change diagnoses or documentation to force payment or coverage.

• Following an unsupported billing instruction because a supervisor requested it.

• AAPC separately estimates Compliance questions and embeds compliance throughout cases; focus on documentation integrity, ABNs, NCCI, HIPAA, and overpayments.

Biliary: gallbladder → cystic duct → common bile duct system; cholangiography evaluates the bile ducts. Colonoscopy landmarks: terminal ileum → cecum → ascending → transverse → descending → sigmoid → rectum. Upper GI: esophagus → stomach → pylorus → duodenum. Major duodenal papilla is where biliary/pancreatic secretions enter the duodenum. Cardiac: LA → mitral valve → LV → aortic valve → aorta; pulmonary artery goes RV → lungs.

• Confusing ureter with urethra, pleura with peritoneum, or median with ulnar nerve.

• AAPC estimates 7 Anatomy, 7 Medical Terminology, and 10 case questions; use anatomy to interpret procedure documentation and integrate diagnosis, procedure, and payment rules.