Diana Sewell, M.D.
NPI 1821247065 · Internal Medicine Physician · Norwalk, CT
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diana Sewell, M.D. is a Internal Medicine Physician provider in Norwalk, CT (NPI 1821247065).
Provider details
- NPI number
- 1821247065
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
17 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
403 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 35 Minutes99232 | 215 | $80 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 110 | $121 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 33 | $117 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 29 | $81 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 16 | $177 |
Typical Medicare-allowed amounts for these services range $80–$177 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-09-11
- Last updated
- 2017-01-25
Frequently asked questions
- What is Diana Sewell's NPI number?
- Diana Sewell's National Provider Identifier (NPI) is 1821247065, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diana Sewell's specialty?
- Diana Sewell is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Diana Sewell located?
- Diana Sewell's practice location on file with NPPES is 34 Maple St, Norwalk, CT 06850-3815.
- What is Diana Sewell's phone number?
- The practice phone number listed in the NPPES registry for Diana Sewell is (203) 852-2000.
- Does Diana Sewell accept Medicare?
- Diana Sewell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diana Sewell's NPI active?
- Yes — Diana Sewell's NPI (1821247065) is active in the NPPES registry as of the last update on 2017-01-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.