NPI registry status
Active
2026 NPPES data Neurology Physician NPI 1619923786 M.D.
Verify on CMS → Andrew Mammen, M.D.
Neurology Physician in Baltimore, Maryland.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 19,885 in Neurology 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
229
Medicare Part D claims · 17 beneficiaries · Neurology Physician avg: 1K
Generic prescribing
38%
generic claims · 62% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$89.52
1 payments · CMS Open Payments (Sunshine Act)
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
Andrew Mammen, M.D. filed 229 Medicare Part D claims in 2023 as a Neurology Physician in Baltimore, Maryland, prescribing 38% generic.
- 229
- Part D claims, 2023
- 38%
- generic prescribing
- $89.52
- industry payments (Sunshine Act)
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.
Andrew Mammen, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
229 49th percentile higher than 49% 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)
Andrew Mammen, 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 Andrew Mammen, M.D.?
Quality data not reportedPrimary specialty
Neurology Physician
Medicare Part D claims
229 83% vs specialty avg
Specialty distribution in Maryland
How Neurology Physician compares to other specialties among Maryland 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 Neurology 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).
Andrew Mammen, M.D. appears in the CMS NPPES registry as a Neurology Physician provider holding M.D. credentials at 4940 EASTERN AVE, Baltimore, MD, 21224, with a listed phone of (410) 550-5624. NPI 1619923786 was issued on 05/26/2006.
Medicare Part D records for calendar year 2023 show 229 prescription claims written by this provider, covering 17 Medicare beneficiaries and totaling roughly $1.6 million in drug spend, split 62% brand-name and 38% generic by claim count, with an opioid prescribing rate of 5.2%.
Neurology Physician is a mid-sized specialty nationwide, with 19,885 enrolled providers across 54 states and an average of 1,309 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 | 1619923786 |
|---|---|
| Specialty | Neurology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/26/2006 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Andrew Mammen, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$90
Largest payer
UCB, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Brand-heavy
Andrew Mammen, M.D. - brand share 62.0%
Neurology Physician average
62% brand-name claims vs 38% generic, on 229 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.
229
Total Claims
$1.6M
Total Drug Cost
17
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 272
- Total Day Supply
- 7,805
- Brand vs Generic
- 62% brand / 38% generic
- Brand Drug Cost
- $1.6M
- Generic Drug Cost
- $6K
- Opioid Claims
- 12 (5.2% rate)
Patient Demographics
- Average Patient Age
- 67.7 years
- Avg HCC Risk Score
- 1.60
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Andrew Mammen, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Privigen
Privigen
89 claims
- Methotrexate 21
Methotrexate
21 claims
- Gammagard Liquid 19
Gammagard Liquid
19 claims
- Mycophenolate Mofe… 19
Mycophenolate Mofetil
19 claims
- Azathioprine 18
Azathioprine
18 claims
- Gammaked 13
Gammaked
13 claims
- Gamunex-C 13
Gamunex-C
13 claims
- Tramadol Hcl Er 12
Tramadol Hcl Er
12 claims
| Drug | Claims |
|---|---|
| Privigen Immun Glob G(Igg)/Pro/Iga 0-50 | 89 |
| Methotrexate Methotrexate Sodium | 21 |
| Gammagard Liquid Immun Glob G(Igg)/Gly/Iga Ov50 | 19 |
| Mycophenolate Mofetil | 19 |
| Azathioprine | 18 |
| Gammaked Immune Globul G/Gly/Iga Avg 46 | 13 |
| Gamunex-C Immune Globul G/Gly/Iga Avg 46 | 13 |
| Tramadol Hcl Er Tramadol Hcl | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Neurology Physician Overview
How Andrew Mammen, M.D. fits within the Neurology Physician landscape nationally.
19,885
Neurology Physician Providers in US
54
States with Neurology Physician
1,309
Avg Claims per Provider
Andrew Mammen, M.D.'s 229 claims are below the specialty average of 1,309.
Nearby Neurology Physician Providers in Maryland
Other clinicians with the same primary specialty enrolled in Maryland, drawn from the same CMS NPPES roster as Mammen.
Dr. Orwa Aboud
M.D. PH.D
Baltimore, MD
Dr. Malik Adil
MD
Bethesda, MD
Dr. Busranur Agac
MD
Bethesda, MD
Dr. Gurdeep Ahluwalia
M.D.
Annapolis, MD
Dr. Ghasan Ahmad
MD
Baltimore, MD
Compare Neurology 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 Maryland medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Neurology 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 Andrew Mammen, M.D.'s specialty? ▼
Andrew Mammen, M.D. specializes in Neurology Physician and practices in Baltimore, Maryland. Credentials: M.D..
How much does Andrew Mammen, M.D. prescribe under Medicare Part D? ▼
In 2023, Andrew Mammen, M.D. wrote 229 Medicare Part D claims totaling $1.6M in drug costs for 17 beneficiaries.
Where is Andrew Mammen, M.D. located? ▼
Andrew Mammen, M.D. is located at 4940 EASTERN AVE, Baltimore, MD, 21224. Phone: (410) 550-5624.
What is Andrew Mammen, M.D.'s NPI number? ▼
Andrew Mammen, M.D.'s National Provider Identifier (NPI) is 1619923786, issued on 05/26/2006.
Does Andrew Mammen, M.D. prescribe more brand-name or generic drugs? ▼
Andrew Mammen, M.D.'s prescribing is 62% brand-name and 38% generic drugs by claim count, with $1.6M in brand drug costs.
Does Andrew Mammen, M.D. prescribe opioids? ▼
Yes, Andrew Mammen, M.D. had 12 opioid claims in 2023 with an opioid prescribing rate of 5.2%.
How many Neurology Physician providers are there in the US? ▼
There are 19,885 Neurology Physician providers across 54 states in the US. The average Neurology Physician provider writes 1,309 Medicare Part D claims per year.
What drugs does Andrew Mammen, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Andrew Mammen, M.D.'s most frequently prescribed drugs include Privigen, Methotrexate, Gammagard Liquid. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Andrew Mammen, M.D. accept Medicare? ▼
Andrew Mammen, M.D. appears in CMS Medicare data with 229 Part D claims and 17 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Andrew Mammen, M.D.'s credentials? ▼
Andrew Mammen, M.D.'s NPI is 1619923786 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.