C1820 HCPCS code: Generator, neurostimulator (implantable), with rechargeable battery and charging system

C1820 is the HCPCS Level II code for generator, neurostimulator (implantable), with rechargeable battery and charging system. Its Medicare coverage code is D (Special coverage instructions apply): Medicare covers it when its national or local coverage criteria are met. The NCCI unit limit is 2 per day on outpatient hospital claims.

Code details

NCCI unit limits (MUE)

Medicare policy articles for this code

• A53359: Billing and Coding: Sacral Nerve Stimulation for Urinary and Fecal Incontinence (Noridian Healthcare Solutions, LLC (MAC - Part A, MAC - Part B))
• A59332: Billing and Coding: Sacral Nerve Stimulation for the Treatment of Urinary and Fecal Incontinence (Palmetto GBA (MAC - Part A, MAC - Part B))

Covered diagnoses (47 ICD-10-CM codes)

The diagnoses most often listed as covered in the policy articles above:

Showing 10 of 47. The full list, non-covered diagnoses and CSV export are in Caduvo.

What changed for C1820

• 2006-01-01: C1820 added to HCPCS Level II
• Next scheduled CMS quarterly update (HCPCS and DMEPOS fee schedule): 2027-01-01

Frequently asked questions

What is HCPCS code C1820?

C1820 is the HCPCS Level II code for generator, neurostimulator (implantable), with rechargeable battery and charging system. Short descriptor: "Generator neuro rechg bat sy".

Does Medicare cover C1820?

Coverage code D — Special coverage instructions apply. Medicare covers it when its national or local coverage criteria are met.

Which diagnoses support coverage for C1820?

Medicare policy articles that cite C1820 list 47 covered ICD-10-CM diagnosis codes across 2 articles. The most cited include N30.10 (Interstitial cystitis (chronic) without hematuria), N30.11 (Interstitial cystitis (chronic) with hematuria), N39.41 (Urge incontinence). A listed diagnosis is necessary but not sufficient; the policy's other criteria still apply.

How many units of C1820 can be billed per day?

2 on outpatient hospital claims; 2 on practitioner claims (NCCI medically unlikely edits).

Related C18 codes

• C1813 — Prosthesis, penile, inflatable
• C1814 — Retinal tamponade device, silicone oil
• C1815 — Prosthesis, urinary sphincter (implantable)
• C1816 — Receiver and/or transmitter, neurostimulator (implantable)
• C1817 — Septal defect implant system, intracardiac
• C1818 — Integrated keratoprosthesis
• C1819 — Surgical tissue localization and excision device (implantable)
• C1821 — Interspinous process distraction device (implantable)
• C1822 — Generator, neurostimulator (implantable), high frequency, with rechargeable battery and charging system
• C1823 — Generator, neurostimulator (implantable), non-rechargeable, with transvenous sensing and stimulation leads
• C1824 — Generator, cardiac contractility modulation (implantable)
• C1825 — Generator, neurostimulator (implantable), non-rechargeable with carotid sinus baroreceptor stimulation lead(s)

Building a device that would bill under a code like this? Caduvo matches a device description to HCPCS/CPT codes, Medicare coverage and payment, and the FDA pathway in one report.

Next steps

• Run a reimbursement report for a device billed under C1820
• Watch C1820 for fee, coverage and descriptor changes
• Build a full Medicare revenue model for C1820

Sources: CMS HCPCS Level II release October 2025; CMS DMEPOS fee schedule; CMS NCCI MUE tables; CMS Medicare utilization (physician and DME supplier files); CMS Medicare Coverage Database articles. Fees are Medicare allowables, not commercial rates. Not billing or legal advice.

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