Mark Johnson, PA-C MT ASCP
NPI 1568453132 · Physician Assistant · Saint Charles, MO
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Johnson, PA-C MT ASCP is a Physician Assistant provider in Saint Charles, MO (NPI 1568453132).
Provider details
- NPI number
- 1568453132
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C MT ASCP
- Sex
- Male
- Sole proprietor
- No
- License
- 2010013488 (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
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
376 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) |
|---|---|---|
| Subsequent Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, at Least 45 Minutes99310 | 103 | $125 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 80 | $98 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 79 | $141 |
| Subsequent Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, at Least 45 Minutes99310 | 49 | $125 |
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 47 | $88 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 57 | 54 |
| Ondansetronbrand: Ondansetron Odt | 29 | 28 |
| Prednisone | 25 | 24 |
| Cephalexin | 18 | 18 |
| Cefdinir | 16 | 16 |
| Tramadol Hcl | 16 | — |
| Diclofenac Sodium | 11 | — |
Practice location
Mailing address
Additional practice locations (2)
- 100 Medical PlzLake St Louis, MO 63367-1366Phone: (636) 625-5200Fax: (636) 625-5314
- 11111 Wilcrest Green DrSuite 210Houston, TX 77042-4813Phone: (337) 521-2836
Registry dates
- Enumerated
- 2005-11-02
- Last updated
- 2020-03-13
- Certified
- 2020-03-13
Frequently asked questions
- What is Mark Johnson's NPI number?
- Mark Johnson's National Provider Identifier (NPI) is 1568453132, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Johnson's specialty?
- Mark Johnson is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mark Johnson located?
- Mark Johnson's practice location on file with NPPES is 300 1st Capitol Dr, Saint Charles, MO 63301-2844.
- What is Mark Johnson's phone number?
- The practice phone number listed in the NPPES registry for Mark Johnson is (636) 947-5000.
- Does Mark Johnson accept Medicare?
- Mark Johnson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Johnson's NPI active?
- Yes — Mark Johnson's NPI (1568453132) is active in the NPPES registry as of the last update on 2020-03-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.