Mason Ridge Ambulatory Surgery Center Lp
NPI 1821453796 · Ambulatory Surgical Clinic/Center · Saint Louis, MO
Enrolled with Medicare as Part B Supplier - Ambulatory Surgical Center · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mason Ridge Ambulatory Surgery Center Lp is a Ambulatory Surgical Clinic/Center organization in Saint Louis, MO (NPI 1821453796).
Provider details
- NPI number
- 1821453796
- Entity type
- Organization
- Primary specialty
- Ambulatory Surgical Clinic/CenterAmbulatory Health Care Facilities
- Organization subpart
- No
- Authorized official
- Chris Hartshorn, Officer/Authorized Official(314) 800-2017
Specialties & taxonomies
Ambulatory Health Care Facilities
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 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
1,265 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) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 447 | $581 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 237 | $356 |
| Colorectal Cancer Screening; Colonoscopy on Individual at High RiskG0105 | 191 | $451 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 187 | $477 |
| Colorectal Cancer Screening; Colonoscopy on Individual Not Meeting Criteria for High RiskG0121 | 82 | $452 |
Practice location
Mailing address
Other names (DBA / former)
- Doing business as
- Gateway Endoscopy Center
- Doing business as
- Gateway Endoscopy Center
Registry dates
- Enumerated
- 2015-12-21
- Last updated
- 2024-10-11
- Certified
- 2024-10-11
Frequently asked questions
- What is Mason Ridge Ambulatory Surgery Center Lp's NPI number?
- Mason Ridge Ambulatory Surgery Center Lp's National Provider Identifier (NPI) is 1821453796, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mason Ridge Ambulatory Surgery Center Lp?
- Mason Ridge Ambulatory Surgery Center Lp is classified in the NPPES registry as Ambulatory Surgical Clinic/Center (Ambulatory Health Care Facilities).
- Where is Mason Ridge Ambulatory Surgery Center Lp located?
- Mason Ridge Ambulatory Surgery Center Lp's practice location on file with NPPES is 12855 N 40 Dr, Saint Louis, MO 63141-8657.
- What is Mason Ridge Ambulatory Surgery Center Lp's phone number?
- The practice phone number listed in the NPPES registry for Mason Ridge Ambulatory Surgery Center Lp is (314) 336-1130.
- Does Mason Ridge Ambulatory Surgery Center Lp accept Medicare?
- Mason Ridge 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 Mason Ridge Ambulatory Surgery Center Lp?
- The authorized official listed on Mason Ridge Ambulatory Surgery Center Lp's NPPES record is Chris Hartshorn, Officer/Authorized Official. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mason Ridge Ambulatory Surgery Center Lp's NPI active?
- Yes — Mason Ridge Ambulatory Surgery Center Lp's NPI (1821453796) is active in the NPPES registry as of the last update on 2024-10-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.