Mary Ernst, CRNA
NPI 1477864213 · Certified Registered Nurse Anesthetist · O Fallon, MO
Enrolled with Medicare as Practitioner - Certified Registered Nurse Anesthetist (crna) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Ernst, CRNA is a Certified Registered Nurse Anesthetist provider in O Fallon, MO (NPI 1477864213).
Provider details
- NPI number
- 1477864213
- Entity type
- Individual
- Primary specialty
- Certified Registered Nurse AnesthetistPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- CRNA
- Sex
- Female
- Sole proprietor
- No
- License
- 2010020077 (MO)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 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
16 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) |
|---|---|---|
| Anesthesia for Other Procedure on Lower Leg, Ankle, and Foot Bones01480 | 16 | $88 |
Typical Medicare-allowed amounts for these services range $88–$88 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-06-26
- Last updated
- 2025-04-17
Frequently asked questions
- What is Mary Ernst's NPI number?
- Mary Ernst's National Provider Identifier (NPI) is 1477864213, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Ernst's specialty?
- Mary Ernst is listed in the NPPES registry with a primary specialty of Certified Registered Nurse Anesthetist (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Ernst located?
- Mary Ernst's practice location on file with NPPES is 2 Progress Point Pkwy, O Fallon, MO 63368-2205.
- What is Mary Ernst's phone number?
- The practice phone number listed in the NPPES registry for Mary Ernst is (800) 862-9980.
- Does Mary Ernst accept Medicare?
- Mary Ernst is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Ernst's NPI active?
- Yes — Mary Ernst's NPI (1477864213) is active in the NPPES registry as of the last update on 2025-04-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.