NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1730137019 M.D.
Verify on CMS → Mark Case, M.D.
Family Medicine Physician in Middletown, Delaware.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 147,760 in Family Medicine Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
7K
Medicare Part D claims · 4K beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
37%
generic claims · 63% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mark Case, M.D. filed 7,290 Medicare Part D claims in 2023 as a Family Medicine Physician in Middletown, Delaware, prescribing 37% generic.
- 7K
- Part D claims, 2023
- 37%
- generic prescribing
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Mark Case, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
7,290 Top 3% higher than 97% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Mark Case, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Mark Case, M.D.?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
7,290 113% vs specialty avg
Specialty distribution in Delaware
How Family Medicine Physician compares to other specialties among Delaware providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Family Medicine Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Mark Case, M.D. appears in the CMS NPPES registry as a Family Medicine Physician provider holding M.D. credentials at 124 SLEEPY HOLLOW DR STE 200, Middletown, DE, 19709, with a listed phone of (302) 449-1710. NPI 1730137019 was issued on 05/05/2006.
Medicare Part D records for calendar year 2023 show 7,290 prescription claims written by this provider, covering 3,599 Medicare beneficiaries and totaling roughly $1.5 million in drug spend, split 63% brand-name and 37% generic by claim count.
Family Medicine Physician is a high-volume specialty nationwide, with 147,760 enrolled providers across 56 states and an average of 3,418 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1730137019 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/05/2006 |
Brand vs generic prescribing mix · Brand-heavy
Mark Case, M.D. - brand share 63.0%
Family Medicine Physician average
63% brand-name claims vs 37% generic, on 7,290 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
7,290
Total Claims
$1.5M
Total Drug Cost
3,599
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 11,648
- Total Day Supply
- 219,576
- Brand vs Generic
- 63% brand / 37% generic
- Brand Drug Cost
- $1.4M
- Generic Drug Cost
- $77K
- Antibiotic Claims
- 133
Patient Demographics
- Average Patient Age
- 74.5 years
- Avg HCC Risk Score
- 0.97
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 102, 65-74: 1,865, 75-84: 1,302, 85+: 330
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Case, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Arexvy
Arexvy
2,755 claims
- Shingrix
Shingrix
1,195 claims
- Atorvastatin Calcium 204
Atorvastatin Calcium
204 claims
- Amlodipine Besylate 118
Amlodipine Besylate
118 claims
- Levothyroxine Sodium 118
Levothyroxine Sodium
118 claims
- Omeprazole 88
Omeprazole
88 claims
- Losartan Potassium 82
Losartan Potassium
82 claims
- Glimepiride 77
Glimepiride
77 claims
| Drug | Claims |
|---|---|
| Arexvy Rsvpref3 Antigen/As01e/Pf | 2,755 |
| Shingrix Varicella-Zoster Ge/As01b/Pf | 1,195 |
| Atorvastatin Calcium | 204 |
| Amlodipine Besylate | 118 |
| Levothyroxine Sodium | 118 |
| Omeprazole | 88 |
| Losartan Potassium | 82 |
| Glimepiride | 77 |
| Metoprolol Succinate | 69 |
| Alprazolam | 63 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Mark Case, M.D. fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Mark Case, M.D.'s 7,290 claims are above the specialty average of 3,418.
Nearby Family Medicine Physician Providers in Delaware
Other clinicians with the same primary specialty enrolled in Delaware, drawn from the same CMS NPPES roster as Case.
Dr. Remedios Abad
MD
Wilmington, DE
Dr. Heran Abiye
MD
Newark, DE
Dr. Jerome Abrams
M.D.
Dover, DE
Dr. Gregory Adams
M.D.
Bear, DE
Dr. Rakesh Agarwal
M.D.
Wilmington, DE
Compare Family Medicine Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Delaware medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Family Medicine Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Mark Case, M.D.'s specialty? ▼
Mark Case, M.D. specializes in Family Medicine Physician and practices in Middletown, Delaware. Credentials: M.D..
How much does Mark Case, M.D. prescribe under Medicare Part D? ▼
In 2023, Mark Case, M.D. wrote 7,290 Medicare Part D claims totaling $1.5M in drug costs for 3,599 beneficiaries.
Where is Mark Case, M.D. located? ▼
Mark Case, M.D. is located at 124 SLEEPY HOLLOW DR STE 200, Middletown, DE, 19709. Phone: (302) 449-1710.
What is Mark Case, M.D.'s NPI number? ▼
Mark Case, M.D.'s National Provider Identifier (NPI) is 1730137019, issued on 05/05/2006.
Does Mark Case, M.D. prescribe more brand-name or generic drugs? ▼
Mark Case, M.D.'s prescribing is 63% brand-name and 37% generic drugs by claim count, with $1.4M in brand drug costs.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does Mark Case, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Case, M.D.'s most frequently prescribed drugs include Arexvy, Shingrix, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Case, M.D. accept Medicare? ▼
Mark Case, M.D. appears in CMS Medicare data with 7,290 Part D claims and 3,599 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Case, M.D.'s credentials? ▼
Mark Case, M.D.'s NPI is 1730137019 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.