Marissa Irene Johnson , PA-C
Physician Assistant • Boston, MA
Professional Overview & Biography Verified Profile Summary
Marissa Johnson, PA-C is a certified Physician Assistant practicing in Boston, MA. With approximately 11 years of clinical experience since completing medical education in 2015, Marissa Johnson delivers high-quality medical care to the local community at 450 BROOKLINE AVE.
Marissa Johnson is affiliated with Lahey Clinic Inc and accepts Medicare assignment.
Frequently performed procedures and clinical services include initial hospital care with moderate level of medical decision making, if using time, at least, initial hospital care with straightforward or low-level medical decision making, if using time, at least, subsequent hospital care with moderate levelof medical decision making, if using time, at least. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.
Practice Location & Contact Primary Location
450 Brookline Ave
Boston, MA 022155450
Medicare Profile & Education
Other
2015
✓ Accepts Assignment
In-Person Only
Specialty Benchmarks & Practice Insights
Comparative analytics for Physician Assistant in Boston, MA
Practicing in Boston, MA (4746 Statewide)
In-Person Office Visits Only
Under CMS Medicare Fee Schedule vs Standard Submitted Charges
Clinical Seniority & Experience Comparison
Performed Procedures & Service Volume
Top Medicare Part B procedures performed by this practitioner
| HCPCS Code & Description | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
|
99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
|
162 | 161 | $583.43 | $149.74 |
|
99222
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes
|
12 | 12 | $400.00 | $112.64 |
Medical Specialties & State Licenses
CMS Verified: 2026-06-26NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
NUCC Taxonomy Code: 363AM0700X
Definition to come...
Hospital & Practice Group Affiliations
Lahey Clinic Inc
29 Mall Rd, Burlington, MA 018050001
Lahey Clinic Inc
41 Mall Rd, Burlington, MA 018050001
Lahey Clinic Inc
41 Mall Rd, Burlington, MA 018050001
Lahey Clinic Inc
1 Essex Ctr Dr, Peabody, MA 019602901
Phone: 9785384000
Secondary Practice Locations
41 Mall Rd
Burlington, MA 018056616
Phone: 7817448000
489 State St
Bangor, ME 044016616
Phone: 2079737000
Practice Associates & Co-Workers
Healthcare professionals and specialists practicing at this location or sharing practice phone/fax
Internal Medicine - Pulmonary Disease
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Physician Assistant
Physician Assistant (Certified)
Physician Assistant
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Chronological log of verified NPI updates, location relocations, credentials, and registry changes
Registered at 450 BROOKLINE AVE, BOSTON, MA 022155450 (Tel: 6172780055)
Registered at 450 BROOKLINE AVE, BOSTON, MA 022155450
NPI status registered as active in NPPES database
Registered at 43 WHITING HILL RD STE 300, BREWER, ME 044121006
Registered at 489 STATE ST, BANGOR, ME 044016616 (Tel: 2079737000)
Recorded as MARISSA JOHNSON, PA-C
Physician Assistant (License #PA1616 in ME)
NPI status registered as active in NPPES database
Registered at 489 STATE ST, BANGOR, ME 044016616 (Tel: 2079737000)
Registered at 489 STATE ST, BANGOR, ME 044016616 (Tel: 2079737000)
Recorded as MARISSA JOHNSON, PA-C
Physician Assistant (License #PA1616 in ME)
First registered as active Individual Practitioner in NPPES Database.
Patient & Community Reviews
Verified patient ratings, medical care experiences, and facility photos
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NPI Administrative Meta
Mailing Address
450 Brookline Ave
Boston, MA 022155450
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