Mark Lasswell, CRNA
NPI 1639164734 · Certified Registered Nurse Anesthetist · Clinton, MO
Enrolled with Medicare as Practitioner - Certified Registered Nurse Anesthetist (crna) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Lasswell, CRNA is a Certified Registered Nurse Anesthetist provider in Clinton, MO (NPI 1639164734).
Provider details
- NPI number
- 1639164734
- Entity type
- Individual
- Primary specialty
- Certified Registered Nurse AnesthetistPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- CRNA
- Sex
- Male
- Sole proprietor
- No
- License
- 115280 (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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
39 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 Esophagus, Stomach, Or Upper Small Bowel Using an Endoscope00731 | 21 | $121 |
| Anesthesia for Lens Surgery00142 | 18 | $126 |
Typical Medicare-allowed amounts for these services range $121–$126 (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
Additional practice locations (1)
- 251 Skaggs RdBranson, MO 65616-2031Phone: (800) 277-8151
Registry dates
- Enumerated
- 2005-09-14
- Last updated
- 2022-03-30
- Certified
- 2022-03-30
Frequently asked questions
- What is Mark Lasswell's NPI number?
- Mark Lasswell's National Provider Identifier (NPI) is 1639164734, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Lasswell's specialty?
- Mark Lasswell is listed in the NPPES registry with a primary specialty of Certified Registered Nurse Anesthetist (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mark Lasswell located?
- Mark Lasswell's practice location on file with NPPES is 1600 N 2nd St, Clinton, MO 64735-1297.
- What is Mark Lasswell's phone number?
- The practice phone number listed in the NPPES registry for Mark Lasswell is (660) 885-5511.
- Does Mark Lasswell accept Medicare?
- Mark Lasswell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Lasswell's NPI active?
- Yes — Mark Lasswell's NPI (1639164734) is active in the NPPES registry as of the last update on 2022-03-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.