Timothy Grinnell, PA-C
NPI 1790828119 · Physician Assistant · Waltham, MA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Timothy Grinnell, PA-C is a Physician Assistant provider in Waltham, MA (NPI 1790828119).
Provider details
- NPI number
- 1790828119
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- PA2274 (MA)
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 tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
438 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 223 | $85 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 75 | $104 |
| Replacement of Knee Joint, Both Sides of Knee27447 | 35 | $188 |
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 34 | $70 |
| Replacement of Thigh Bone and Hip Joint With Prosthesis27130 | 34 | $188 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxycodone Hcl | 153 | 98 |
| Hydromorphone Hcl | 46 | 28 |
| Tramadol Hcl | 33 | 27 |
| Meloxicam | 32 | 27 |
| Cefadroxil | 27 | 25 |
| Apixabanbrand: Eliquis | 14 | 14 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$132 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 110 Liberty StBrockton, MA 02301-5521Phone: (508) 565-3055Fax: (508) 894-0757
Registry dates
- Enumerated
- 2007-02-15
- Last updated
- 2024-11-05
- Certified
- 2024-11-05
Frequently asked questions
- What is Timothy Grinnell's NPI number?
- Timothy Grinnell's National Provider Identifier (NPI) is 1790828119, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Timothy Grinnell's specialty?
- Timothy Grinnell is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Timothy Grinnell located?
- Timothy Grinnell's practice location on file with NPPES is 840 Winter St, Waltham, MA 02451-1433.
- What is Timothy Grinnell's phone number?
- The practice phone number listed in the NPPES registry for Timothy Grinnell is (781) 890-2133.
- Does Timothy Grinnell accept Medicare?
- Timothy Grinnell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Timothy Grinnell's NPI active?
- Yes — Timothy Grinnell's NPI (1790828119) is active in the NPPES registry as of the last update on 2024-11-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.