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Edit this profileWhere to find Mark S. Johnson, PA-C MT ASCP
- Saint Charles location main office
300 1St Capitol Dr, Saint Charles, MO 63301 - Houston location
11111 Wilcrest Green Dr, Suite 210, Houston, TX 77042 - Lake Saint Louis location
100 Medical Plz, Lake Saint Louis, MO 63367
About Mark Johnson
Mark S. Johnson, PA-C MT ASCP is a physician assistant practicing in Saint Charles, MO. According to Medicare claims data, Mark cared for 261 Medicare patients across 376 services. The services billed most often include subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes, emergency department visit with moderate level of medical decision making, and emergency department visit with high level of medical decision making. This provider record is associated with NPI 1568453132.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (636) 947-5000
- Email not available
Practice Locations
300 1ST CAPITOL DR
Saint Charles, MO 63301
11111 Wilcrest Green Dr Suite 210
Houston, TX 77042
100 Medical Plz
Lake Saint Louis, MO 63367
Procedures Most Often Billed to Medicare
376 services · 261 patients · 6 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes | Office visit | 99310 |
103 | More often than most peers in Physician Assistant |
| Emergency department visit with moderate level of medical decision making | Office visit | 99284 |
80 | More often than most peers in Physician Assistant |
| Emergency department visit with high level of medical decision making | Office visit | 99285 |
79 | More often than most peers in Physician Assistant |
| Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes | Office visit | 99310 |
49 | More often than most peers in Physician Assistant |
| Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes | Office visit | 99309 |
47 | Less often than most peers in Physician Assistant |
| Emergency department visit with low level of medical decision making | Office visit | 99283 |
18 | As often as other peers in Physician Assistant |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other physician assistants at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 23 related providers in 3 groups
Other physician assistants in Saint Charles 7
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2004 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What kind of doctor is Mark S. Johnson?
Mark S. Johnson is a physician assistant in Saint Charles, MO. That is the designation recorded for this NPI in the federal registry.
NPI registry
What is Mark S. Johnson's address?
Mark S. Johnson is listed at 300 1St Capitol Dr, Saint Charles, MO 63301. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Mark S. Johnson?
The number on file is (636) 947-5000. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Mark S. Johnson's NPI number?
Mark S. Johnson's National Provider Identifier is 1568453132. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Mark S. Johnson train?
Mark S. Johnson attended Other, graduating in 2004. This comes from the CMS National Downloadable File.
CMS public data
How long has Mark S. Johnson been practicing?
Mark S. Johnson has 22 years experience. Calculated from a graduation year of 2004, reported in the CMS National Downloadable File.
CMS public data
What procedures does Mark S. Johnson perform?
According to Medicare billing data, Mark S. Johnson the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Mark S. Johnson confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Mark S. Johnson. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.