Diane Sun, MD
NPI 1245721018 · Internal Medicine Physician · Boston, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diane Sun, MD is a Internal Medicine Physician provider in Boston, MA (NPI 1245721018).
Provider details
- NPI number
- 1245721018
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 276319 (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
8 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
280 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 81 | $124 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 74 | $81 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 45 | $180 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 33 | $85 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 32 | $121 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 15 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-05-28
- Last updated
- 2018-05-28
Frequently asked questions
- What is Diane Sun's NPI number?
- Diane Sun's National Provider Identifier (NPI) is 1245721018, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diane Sun's specialty?
- Diane Sun is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Diane Sun located?
- Diane Sun's practice location on file with NPPES is 800 Washington St, Boston, MA 02111-1552.
- What is Diane Sun's phone number?
- The practice phone number listed in the NPPES registry for Diane Sun is (617) 636-5000.
- Does Diane Sun accept Medicare?
- Diane Sun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diane Sun's NPI active?
- Yes — Diane Sun's NPI (1245721018) is active in the NPPES registry as of the last update on 2018-05-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.