Timothy Loo, M.D.
NPI 1871584813 · Internal Medicine Physician · Boston, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Timothy Loo, M.D. is a Internal Medicine Physician provider in Boston, MA (NPI 1871584813).
Provider details
- NPI number
- 1871584813
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 215918 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,323 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 433 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 359 | $102 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 160 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 133 | $69 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 103 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 393 | 117 |
| Amlodipine Besylate | 321 | 91 |
| Omeprazole | 174 | 51 |
| Metoprolol Succinate | 149 | 36 |
| Losartan Potassium | 144 | 44 |
| Lisinopril | 140 | 40 |
| Gabapentin |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-31
- Last updated
- 2007-09-06
Frequently asked questions
- What is Timothy Loo's NPI number?
- Timothy Loo's National Provider Identifier (NPI) is 1871584813, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Timothy Loo's specialty?
- Timothy Loo is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Timothy Loo located?
- Timothy Loo's practice location on file with NPPES is 330 Brookline Ave, Boston, MA 02215-5400.
- What is Timothy Loo's phone number?
- The practice phone number listed in the NPPES registry for Timothy Loo is (617) 667-9600.
- Does Timothy Loo accept Medicare?
- Timothy Loo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Timothy Loo's NPI active?
- Yes — Timothy Loo's NPI (1871584813) is active in the NPPES registry as of the last update on 2007-09-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.