Does R18.8 require prior authorization?

No, R18.8 does not require prior authorization (high confidence). Code is covered without prior authorization.

`R18.8` — Other ascites

ICD-10-CM

No Prior Auth Required

Code is covered without prior authorization (high confidence)

This billing and coding article provides guidelines that complement Local Coverage Determination L34415 for CT of the abdomen and pelvis; consult LCD L34415 for specific coverage indications, limitations, and documentation requirements.
For services requiring a referring/ordering physician, the referring/ordering physician's name and NPI must be reported on the claim.
Diagnostic test claims should include the test result if known; if result is not available, report the symptoms that prompted the test.
The patient's medical record must include the ordering provider's assessment related to the visit complaint, relevant medical history, results of pertinent tests/procedures, and a signed and dated office visit record or operative report.

CPT 88182 reports the physician professional and facility technical components of DNA ploidy and S-phase analysis of tumor by flow cytometry.
CPT 88184 (first marker) and CPT 88185 (each additional marker) report the facility technical component of flow cytometric immunophenotyping for assessment of potential hematolymphoid neoplasia.
Flow cytometry interpretation is reported using CPT codes 88187–88189 (one interpretation code per specimen).
Quantitative cell counts by flow cytometry are billed using CPT codes 86355, 86356, 86357, 86359, 86360, 86361, and 86367.
Flow cytometry services are payable under Medicare Part B at specified places of service according to CPT: groups of CPTs have defined allowable POS (see mapping in policy).
Non-invasive vascular diagnostic tests are covered when ordered by the treating practitioner or a consulting physician who will use the results to manage the beneficiary's specific medical problem.

L35755 — Non-Invasive Abdominal / Visceral Vascular Studies

J05

A57591 — Billing and Coding: Non-Invasive Abdominal / Visceral Vascular Studies

J05

A56758 — Billing and Coding: Non-Invasive Vascular Studies

J06

L33627 — Non-Invasive Vascular Studies

J06

L33674

Ask Verity about documentation requirements, denial risks, or coverage in your state.