Provider Profile
Marissa I. Johnson, PA-C
Unclaimed ProfileAbout Marissa Johnson
Marissa I. Johnson, PA-C is a physician assistant practicing in Boston, MA. Marissa is also listed as specializing in physician assistant — medical. Medicare claims data shows Marissa provided 174 services to 173 patients. The services billed most often include initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes and initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
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
- (617) 278-0055
- Email not available
Practice Locations
450 BROOKLINE AVE
Boston, MA 02215
41 Mall Rd
Burlington, MA 01805
489 State St
Bangor, ME 04401
Procedures Most Often Billed to Medicare
174 services · 173 patients · 2 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
162 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
12 |
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 6
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 Boston 7
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2015 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What kind of doctor is Marissa I. Johnson?
Marissa I. Johnson is a physician assistant in Boston, MA. That is the designation recorded for this NPI in the federal registry.
NPI registry
What is Marissa I. Johnson's address?
Marissa I. Johnson is listed at 450 Brookline Ave, Boston, MA 02215. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Marissa I. Johnson?
The number on file is (617) 278-0055. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Marissa I. Johnson?
Marissa I. Johnson's National Provider Identifier is 1447703525. 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 Marissa I. Johnson train?
Marissa I. Johnson attended Other, graduating in 2015. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Marissa I. Johnson have?
Marissa I. Johnson has 11 years experience. Calculated from a graduation year of 2015, reported in the CMS National Downloadable File.
CMS public data
What procedures does Marissa I. Johnson perform?
According to Medicare billing data, Marissa I. 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
Is Marissa I. Johnson's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Marissa I. Johnson. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.