Charmian Cohen, M.D.
NPI 1003929043 · Endocrinology, Diabetes & Metabolism Physician · Riverhead, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charmian Cohen, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in Riverhead, NY (NPI 1003929043).
Provider details
- NPI number
- 1003929043
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 161564-1 (NY)
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
19 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
173 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 173 | $163 |
Typical Medicare-allowed amounts for these services range $163–$163 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 18 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 144 | 33 |
| Metformin Hcl | 57 | 15 |
| Levothyroxine Sodiumbrand: Synthroid | 53 | 12 |
| Insulin Degludecbrand: Tresiba Flextouch U-200 | 49 | 12 |
| Semaglutidebrand: Ozempic | 34 | — |
| Insulin Aspartbrand: Novolog Flexpen | 29 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-16
- Last updated
- 2025-05-09
- Certified
- 2025-05-09
Frequently asked questions
- What is Charmian Cohen's NPI number?
- Charmian Cohen's National Provider Identifier (NPI) is 1003929043, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charmian Cohen's specialty?
- Charmian Cohen is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Charmian Cohen located?
- Charmian Cohen's practice location on file with NPPES is 632 Roanoke Ave, Riverhead, NY 11901-2728.
- What is Charmian Cohen's phone number?
- The practice phone number listed in the NPPES registry for Charmian Cohen is (631) 939-2127.
- Does Charmian Cohen accept Medicare?
- Charmian Cohen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charmian Cohen's NPI active?
- Yes — Charmian Cohen's NPI (1003929043) is active in the NPPES registry as of the last update on 2025-05-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.