Dr. Mark Hershel Eig , MD
Internal Medicine • Silver Spring, MD
10801 Lockwood Dr, Ste 280
Silver Spring, MD 209011556
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on January 2, 2007; this date does not establish years in practice.
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Published CMS data list 104 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Escitalopram Oxalate — 25 prescription fills, including refills.
- Bupropion Xl (Bupropion Hcl) — 23 prescription fills, including refills.
- Ozempic (Semaglutide) — 18 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 6 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Part D prescriptions than 65% of clinicians listed under Internal Medicine in Silver Spring, MD (2024, 103 clinicians with data). Median for this group: 870. Middle half: 57 to 2,857.
Fewer Part D prescriptions than 75% of clinicians listed under Internal Medicine in Maryland (2024, 2,222 clinicians with data). Median for this group: 1,068. Middle half: 116 to 3,780.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 51 in 2020 to 104 in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020–2024.
Practice Location & Contact Primary Location
10801 Lockwood Dr
Ste 280
Silver Spring, MD 209011556
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
213 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$17,572 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $248.43 across 3 records.
By nature of payment
- Food and Beverage: $248.43 across 3 records.
Reporting-company totals
- Novo Nordisk Inc: $248.43 across 3 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
NPI first issued
2007
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Can order Medicare-covered services
CMS lists Dr. Eig as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Silver Spring and Maryland
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Fewer Part D prescriptions than 65% of clinicians listed under Internal Medicine in Silver Spring, MD (2024, 103 clinicians with data). Median for this group: 870. Middle half: 57 to 2,857.
Fewer Part D prescriptions than 75% of clinicians listed under Internal Medicine in Maryland (2024, 2,222 clinicians with data). Median for this group: 1,068. Middle half: 116 to 3,780.
Part D drug cost
Close to the middle for clinicians listed under Internal Medicine in Silver Spring, MD (2024, 103 clinicians with data). Median for this group: $35,414. Middle half: $709 to $218,742.
A lower Part D drug cost than 65% of clinicians listed under Internal Medicine in Maryland (2024, 2,222 clinicians with data). Median for this group: $89,966. Middle half: $5,334 to $333,437.
187 active clinicians are listed under Internal Medicine with a practice address in Silver Spring, MD (3,909 in Maryland).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Silver Spring
21.4% of these 187 clinicians have the CMS telehealth indicator.
58.3% of these 187 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 104% from 51 in 2020 to 104 in 2024.
- 2020: 51
- 2021: 56
- 2022: 69
- 2023: 101
- 2024: 104
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30-day fills
30-day fills increased 89% from 113 in 2020 to 213 in 2024.
- 2020: 113
- 2021: 138
- 2022: 142
- 2023: 223
- 2024: 213
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Part D drug cost
Part D drug cost increased 578% from $2,591 in 2020 to $17,572 in 2024.
- 2020: $2,591
- 2021: $1,718
- 2022: $1,868
- 2023: $19,743
- 2024: $17,572
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $12.59 in 2019 to $248.43 in 2025.
- 2019: $12.59
- 2020: $31.00
- 2021: $146.07
- 2022: $59.96
- 2025: $248.43
Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 – December 31, 2025): fewer than 11 records totaling $248.43.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
|
Ozempic | General | $120.59 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Wegovy | General | $120.47 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
|
Saxenda | General | $7.37 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Escitalopram Oxalate | Escitalopram Oxalate | 25 | 1,980 | $378.79 | — |
| Bupropion Xl | Bupropion Hcl | 23 | 1,650 | $621.50 | — |
| Ozempic | Semaglutide | 18 | 516 | $16,043.34 | — |
| Dextroamphetamine-Amphet Er | Dextroamphetamine/Amphetamine | 14 | 429 | $309.41 | — |
| Doxazosin Mesylate | Doxazosin Mesylate | 12 | 700 | $106.83 | — |
| Fluoxetine Hcl | Fluoxetine Hcl | 12 | 1,080 | $112.18 | — |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSSources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine - Critical Care Medicine
Doctor of Medicine (M.D.)
Obstetrics & Gynecology
Obstetrics & Gynecology - Gynecology
Doctor of Medicine (M.D.)
Internal Medicine - Gastroenterology
Doctor of Medicine (M.D.)
Nurse Practitioner
Nurse Practitioner
Internal Medicine - Gastroenterology
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated January 02, 2007.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Internal Medicine Providers in Silver Spring
- Dr. Sneha Tella, MD
- Dr. Anuradha Arun, MD
- Dr. Camille Upchurch, MD
- Dr. Lynne Diggs, MD
- Dr. Anjana Dhar, MD
- Dr. Mark Parkhurst, MD
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Mailing Address
10801 Lockwood Dr, Ste 280
Silver Spring, MD 209011556
Phone: 3015921220