Fremont Ambulatory Surgery Center, Lp
NPI 1851369284 · Ambulatory Surgical Clinic/Center · Fremont, CA
Enrolled with Medicare as Part B Supplier - Ambulatory Surgical Center · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Fremont Ambulatory Surgery Center, Lp is a Ambulatory Surgical Clinic/Center organization in Fremont, CA (NPI 1851369284).
Provider details
- NPI number
- 1851369284
- Entity type
- Organization
- Primary specialty
- Ambulatory Surgical Clinic/CenterAmbulatory Health Care Facilities
- Organization subpart
- No
- Authorized official
- John Mazoros, Administrator(510) 456-4650
- License
- 140000600 (CA)
Specialties & taxonomies
Ambulatory Health Care Facilities
Ambulatory Health Care Facilities
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
4,974 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Brachytherapy Source, Non-Stranded, Cesium-131, Per SourceC2643 | 1,715 | $79 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 406 | $594 |
| Injection of Anesthetic And/Or Steroid Drug Into Sacral Spine Nerve Root Using Imaging Guidance, Single Level64483 | 335 | $570 |
| Removal of Polyps Or Growths of Large Bowel Using a Flexible Endoscope With Electrical Cautery45384 | 298 | $753 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 188 | $866 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-10
- Last updated
- 2017-11-02
Frequently asked questions
- What is Fremont Ambulatory Surgery Center, Lp's NPI number?
- Fremont Ambulatory Surgery Center, Lp's National Provider Identifier (NPI) is 1851369284, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Fremont Ambulatory Surgery Center, Lp?
- Fremont Ambulatory Surgery Center, Lp is classified in the NPPES registry as Ambulatory Surgical Clinic/Center (Ambulatory Health Care Facilities).
- Where is Fremont Ambulatory Surgery Center, Lp located?
- Fremont Ambulatory Surgery Center, Lp's practice location on file with NPPES is 39350 Civic Center Dr Suite 100, Fremont, CA 94538-2331.
- What is Fremont Ambulatory Surgery Center, Lp's phone number?
- The practice phone number listed in the NPPES registry for Fremont Ambulatory Surgery Center, Lp is (510) 456-4600.
- Does Fremont Ambulatory Surgery Center, Lp accept Medicare?
- Fremont Ambulatory Surgery Center, Lp is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Fremont Ambulatory Surgery Center, Lp?
- The authorized official listed on Fremont Ambulatory Surgery Center, Lp's NPPES record is John Mazoros, Administrator. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Fremont Ambulatory Surgery Center, Lp's NPI active?
- Yes — Fremont Ambulatory Surgery Center, Lp's NPI (1851369284) is active in the NPPES registry as of the last update on 2017-11-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.