Does N27.1 require prior authorization?

No, N27.1 does not require prior authorization (high confidence). Covered without prior authorization.

`N27.1`, Small kidney, bilateral

ICD-10-CM

No Prior Auth Required

Covered without prior authorization (high confidence)

Medical records must document that the ultrasound was limited to retroperitoneal structures when billing CPT 76770/76775/76776, including images/findings demonstrating limitation to the retroperitoneum.
If the exam was expanded to include organs outside the retroperitoneum, documentation must reflect the expansion and support billing a full or limited abdominal ultrasound (CPT 76700/76705/76706).
Claims and documentation should follow the complementary Local Coverage Determination L34577 and any applicable LCD requirements.
The ordering/referring practitioner's assessment related to the patient's complaint and the specific reason for the test must be documented in the medical record.

Retroperitoneal ultrasound (CPT 76770, 76775, 76776) is covered when the exam is limited solely to retroperitoneal structures.
A full (complete) or limited abdominal ultrasound (CPT 76700, 76705, 76706) is covered when the exam includes organs or structures outside the retroperitoneum or when primary findings involve non-retroperitoneal structures (e.g., gallbladder, liver, spleen, common bile duct).
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.
A documented referral/order must be on record for each individual non-invasive vascular study performed for coverage to apply.
Cerebrovascular arterial duplex follow-up is covered annually for stenosis 20–49% (diameter reduction).
Cerebrovascular arterial duplex follow-up is covered every six months for stenosis 50–79% (diameter reduction).

CGS-J15-L34045, Non-Invasive Vascular Studies

J15

CGS-J18-L34045, Non-Invasive Vascular Studies

J18

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

WPS-J5-L35755, Non-Invasive Abdominal / Visceral Vascular Studies

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