Mark Mendel Sklar, M.D.
Endocrinology, Diabetes & Metabolism Physician · Washington, DC
Mark Mendel Sklar, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Washington, District of Columbia, and NPI 1720083223, issued on Jun 20, 2005. Check the license (District of Columbia MD18512, as entered in NPPES) on the District of Columbia Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Mark Mendel Sklar
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- MD18512 DC
Self-reported in NPPES; status is on the state search - Practice location
- 3 Washington Cir NW, Washington, DC 20037
- Phone
- (202) 887-4769
- Enumerated
- Jun 20, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (202) 223-2552
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 61 in District of Columbia → Look up another NPI →
Also registered at 3 Washington Cir NW
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Mendel Sklar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersDistrict of Columbia Board of Medicine
Search for license MD18512Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
2,646 Medicare Part D claims for 259 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 37% of claims.
Most prescribed
- Synthroid247 claims
- Levothyroxine Sodium207 claims
- Ozempic123 claims
- Atorvastatin Calcium112 claims
- Metformin Hcl110 claims
- Metformin Hcl Er101 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $1,925.34
74 payments; by number, the most common kind was food and beverage; the largest payer was Amneal Pharmaceuticals LLC. The 5,661 providers of this specialty with any payment received $5,742.15 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Mark Mendel Sklar among 61 endocrinology, diabetes & metabolism physician records in District of Columbia
Mark Mendel Sklar, M.D. is one of 61 endocrinology, diabetes & metabolism physician records with a practice address in District of Columbia. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileNo · 52% of these records are
- Record last updated2026 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a District of Columbia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in District of Columbia
There are 61 endocrinology, diabetes & metabolism physician records in District of Columbia.
All 61 in District of Columbia → Every provider in Washington → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Jamil Addas, M.D.Washington, DC 200371831401322
- Suzanne Adler, M.D.Washington, DC 200371164607057
- Joshua Cohen, MDWashington, DC 200371750340378
- Sandeep Dhaliwal, MDWashington, DC 200371811108103
- Nadine El Asmar, M.DWashington, DC 200371649568080
- Diala El-Maouche, MD, MSWashington, DC 200371487817821
- Adline Ghazi, M.D.Washington, DC 200371609033869
- Rasha Haykal, M.D.Washington, DC 200371922455815
Common questions
What is Mark Mendel Sklar, M.D.'s NPI number?
Mark Mendel Sklar, M.D.'s National Provider Identifier (NPI) is 1720083223, issued on Jun 20, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark Mendel Sklar, M.D. located?
The NPPES record lists a practice address at 3 Washington Cir NW, Washington, DC, 20037. Phone: (202) 887-4769. Providers update this record themselves, so call before visiting.
How can I verify Mark Mendel Sklar, M.D.'s license?
NPPES lists District of Columbia license number MD18512, as entered by the provider. Search the District of Columbia Board of Medicine at https://dchealth.dc.gov/bomed. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Mendel Sklar, M.D. prescribe under Medicare Part D?
In 2024, Mark Mendel Sklar, M.D. had 2,646 Medicare Part D claims for 259 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.