Treatment of Kidney Stones | CMS Coverage Update

Summary: The Centers for Medicare & Medicaid Services modified its kidney stone treatment coverage policy, effective May 15, 2026. Here's what billing teams need to know before that date.

CMS kidney stone treatment coverage policy updates affect urology practices, outpatient surgery centers, and hospital outpatient departments billing for lithotripsy and related procedures. This policy does not list specific CPT, HCPCS, or ICD-10 codes in the available data — see the Affected Codes section for details. If your practice treats Medicare patients with nephrolithiasis or urolithiasis, this change is worth your attention before the May 15, 2026 effective date.

Quick-Reference Table

CMS Kidney Stone Treatment Coverage Criteria and Medical Necessity Requirements 2026

The CMS kidney stone treatment coverage policy governs which interventions Medicare will reimburse for nephrolithiasis and urolithiasis. This includes procedural options ranging from extracorporeal shock wave lithotripsy (ESWL) to ureteroscopy with laser lithotripsy to percutaneous nephrolithotomy (PCNL).

The real issue with kidney stone coverage under Medicare is that medical necessity criteria have historically turned on stone size, location, and the failure of conservative management. CMS expects documentation showing why a given procedure — ESWL versus ureteroscopic stone removal versus PCNL — was selected for that specific patient. Vague notes citing "patient preference" don't satisfy medical necessity review. Your documentation needs to show stone burden, imaging findings, and clinical rationale tied to the specific procedure billed.

Prior authorization is not universally required for kidney stone procedures under traditional Medicare fee-for-service. However, Medicare Advantage plans operating under CMS rules frequently impose their own prior auth requirements. If your payer mix includes Medicare Advantage, confirm prior authorization requirements with each plan before scheduling procedures under this updated policy.

This 2026 modification signals that CMS is tightening or clarifying the coverage criteria framework. That typically means auditors will look more closely at whether documentation matches the selected procedure. Now is the right time to audit your clinical documentation templates against the updated standards.

CMS Kidney Stone Treatment Exclusions and Non-Covered Indications

Not every intervention for kidney stones is covered under Medicare's coverage policy. CMS has historically excluded procedures it considers experimental, investigational, or lacking sufficient evidence of clinical benefit.

Some emerging technologies in kidney stone treatment — including certain robotic-assisted ureteroscopy platforms and investigational ultrasound-based stone breaking technologies — may not qualify for reimbursement under this policy. The same applies to procedures performed outside medically necessary indications, such as prophylactic intervention on asymptomatic stones that don't meet size or obstruction thresholds.

Conservative management — hydration, alpha-blockers for medical expulsive therapy, dietary modification — is the expected first-line approach for stones that fall below certain clinical thresholds. Skipping that step and billing for an interventional procedure without documentation of prior conservative management is a claim denial waiting to happen. Your clinical staff and billing team need to be aligned on what the record needs to show.

If you're billing for any newer kidney stone treatment technology introduced in the last two to three years, verify whether it falls within covered indications before the May 15, 2026 effective date. If you're not sure, loop in your compliance officer before you submit claims under this updated policy.

Coverage Indications at a Glance

The source policy document does not provide a detailed, indication-level coverage breakdown with specific covered versus non-covered designations in the available data. The table below reflects the established CMS coverage framework for kidney stone treatment based on the policy's clinical scope. Confirm final criteria against the full policy text at the source URL before the effective date.

CMS Kidney Stone Treatment Billing Guidelines and Action Items 2026

The billing guidelines for kidney stone treatment under the updated CMS policy require your team to act before May 15, 2026 — not after a claim denial forces a rework cycle.

CPT, HCPCS, and ICD-10 Codes for Kidney Stone Treatment Under This CMS Policy

The available policy data for this CMS kidney stone treatment coverage policy does not include a specific list of CPT, HCPCS, or ICD-10 codes. This is the data provided in the source document — no codes are listed.

This is worth flagging to your billing team directly: the absence of a code list in the policy summary does not mean all codes are covered. It means you need to verify coverage at the code level through the full policy document, your MAC's LCD, and the CMS fee schedule before billing.

What to Do Without a Code List

Pull the full policy text from the source at app.payerpolicy.org/p/cms/106-v1. Cross-reference with your MAC's LCD for kidney stone or lithotripsy procedures. If your MAC has published an LCD on extracorporeal shock wave lithotripsy or ureteroscopy, that document will contain the specific CPT and ICD-10 codes that govern reimbursement in your region.

Kidney stone treatment billing regularly involves procedure codes for ESWL, ureteroscopy, and PCNL alongside imaging and anesthesia codes. Your coding team should know which CPT codes your practice uses most frequently for these procedures and should verify each one against the updated coverage policy before May 15, 2026.

If your coding team is unsure which CPT codes fall under this policy's scope, a billing consultant familiar with urology coding can map your charge master to the updated CMS framework quickly. Don't submit claims blind after the effective date.