Provider Profile
Timothy D. Grinnell, PA-C
Unclaimed ProfileAbout Timothy Grinnell
Timothy D. Grinnell, PA-C is a physician assistant based in Waltham, MA. Medicare claims data shows Timothy provided 1,681 services to 406 patients. The services billed most often include injection, methylprednisolone acetate, 1 mg, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and new patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
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
- (781) 890-2133
- Email not available
Practice Locations
840 WINTER ST
Waltham, MA 02451
110 Liberty St
Brockton, MA 02301
Procedures Most Often Billed to Medicare
1,681 services · 406 patients · 8 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Replacement of knee joint, both sides of knee | Procedure | 27447 |
35 | More often than most peers in Physician Assistant |
| Replacement of thigh bone and hip joint with prosthesis | Procedure | 27130 |
34 | More often than most peers in Physician Assistant |
| Aspiration and/or injection of fluid from large joint | Procedure | 20610 |
34 | Less often than most peers in Physician Assistant |
| Revision of thigh and lower leg bone components of total knee joint prosthesis | Procedure | 27487 |
18 | More often than most peers in Physician Assistant |
| Injection, methylprednisolone acetate, 1 mg | Drug given | J1010 |
1,243 | Less often than most peers in Physician Assistant |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
223 | More often than most peers in Physician Assistant |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
75 | More often than most peers in Physician Assistant |
| Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more | Office visit | 99212 |
19 | Less often than most 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 4
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 1
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 — 28 related providers in 4 groups
Other physician assistants in Waltham 5
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2006 at Other 7
Providers who graduated from the same medical school in the same year.
Also performs Replacement of knee joint, both sides of knee 8
Providers in MA who bill this service to Medicare most often.
Common questions
What does Timothy D. Grinnell specialize in?
Timothy D. Grinnell is a physician assistant in Waltham, MA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Timothy D. Grinnell located?
Timothy D. Grinnell is listed at 840 Winter St, Waltham, MA 02451. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Timothy D. Grinnell's phone number?
The number on file is (781) 890-2133. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Timothy D. Grinnell?
Timothy D. Grinnell's National Provider Identifier is 1790828119. 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 Timothy D. Grinnell train?
Timothy D. Grinnell attended Other, graduating in 2006. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Timothy D. Grinnell have?
Timothy D. Grinnell has 20 years experience. Calculated from a graduation year of 2006, reported in the CMS National Downloadable File.
CMS public data
What does Timothy D. Grinnell do most often?
According to Medicare billing data, Timothy D. Grinnell performs procedures including replacement of knee joint, both sides of knee, replacement of thigh bone and hip joint with prosthesis and aspiration and/or injection of fluid from large joint, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Timothy D. Grinnell's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Timothy D. Grinnell. 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.