NPI registry status
Active
2026 NPPES data Medical Oncology Physician NPI 1134443948 MD
Verify on CMS → Catherine Marshall, MD
Medical Oncology 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 4,028 in Medical Oncology 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
458
Medicare Part D claims · 76 beneficiaries · Medical Oncology Physician avg: 732
Generic prescribing
77%
generic claims · 23% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
75/100
CMS neutral threshold · no category scores published
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Catherine Marshall, MD carries the neutral CMS MIPS final score of 75/100, assigned where no category was scored - and filed 458 Medicare Part D claims in 2024.
- 75/100
- CMS neutral score · not measured
- 458
- Part D claims, 2024
- 77%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Federal trust snapshot
What official records show about Catherine Marshall, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1134443948), first enumerated 03/23/2010.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 458 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
CMS assigned a neutral MIPS final score of 75/100 where no performance category was scored — not a measured quality rank.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1134443948 · Medical Oncology Physician
NPI-10 · ENUM-MID · TAX-NARROW · MIPS-NEUTRAL · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1134443948
- ENUM-MID 2010
- TAX-NARROW 4,028
- MIPS-NEUTRAL 75/100
- RX-LIGHT 458
- BOOK-THIN 186 in Maryland
- PHOTO-ENUM Alexander Pearson · 2010
Catherine Marshall, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
458 ≥ 61st percentile 61% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Catherine Marshall, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Catherine Marshall, MD?
CMS neutral score, not measuredPrimary specialty
Medical Oncology Physician
Medicare Part D claims
458 37% vs specialty avg
MIPS final score
75/100
Specialty distribution in Maryland
How Medical Oncology Physician compares to other specialties among Maryland providers
MIPS score not measured
CMS assigned a neutral 75/100 threshold
CMS did not publish any Quality, Cost, Promoting Interoperability, or Improvement Activities category score for this clinician. This administrative threshold is not comparable with the national average of clinicians whose MIPS score was measured.
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).
Practice Address
Provider Details
| NPI | 1134443948 |
|---|---|
| Specialty | Medical Oncology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 03/23/2010 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
CMS neutral threshold · not measured
Reporting: Individual
Hospital and facility affiliations
Facilities where Catherine Marshall, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Johns Hopkins University
Lutherville, MD
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Typical
Catherine Marshall, MD - brand share 23.0%
Medical Oncology Physician average
23% brand-name claims vs 77% generic, on 458 2024 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 2024.
458
Total Claims
$1.1M
Total Drug Cost
76
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 552.967
- Total Day Supply
- 15,469
- Brand vs Generic
- 23% brand / 77% generic
- Brand Drug Cost
- $957K
- Generic Drug Cost
- $187K
- Opioid Claims
- 15 (3.3% rate)
Patient Demographics
- Average Patient Age
- 76.2 years
- Avg HCC Risk Score
- 2.18
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Catherine Marshall, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Abiraterone Acetate
Abiraterone Acetate
109 claims
- Prednisone
Prednisone
92 claims
- Dexamethasone
Dexamethasone
51 claims
- Xtandi 33
Xtandi
33 claims
- Nubeqa 22
Nubeqa
22 claims
- Prochlorperazine M… 20
Prochlorperazine Maleate
20 claims
- Orgovyx 18
Orgovyx
18 claims
- Lynparza 17
Lynparza
17 claims
| Drug | Claims |
|---|---|
| Abiraterone Acetate | 109 |
| Prednisone | 92 |
| Dexamethasone | 51 |
| Xtandi Enzalutamide | 33 |
| Nubeqa Darolutamide | 22 |
| Prochlorperazine Maleate | 20 |
| Orgovyx Relugolix | 18 |
| Lynparza Olaparib | 17 |
| Tamsulosin Hcl | 13 |
| Oxycodone Hcl | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Medical Oncology Physician Overview
How Catherine Marshall, MD fits within the Medical Oncology Physician landscape nationally.
4,028
Medical Oncology Physician Providers in US
53
States with Medical Oncology Physician
732
Avg Claims per Provider
Catherine Marshall, MD's 458 claims are below the specialty average of 732.
Nationwide Medical Oncology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Marshall, both outside Maryland so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (75 here).
Same NPPES enumeration year (2010)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Medical Oncology Physician Providers in Maryland
Other clinicians with the same primary specialty enrolled in Maryland, drawn from the same CMS NPPES roster as Marshall.
One of 186 Medical Oncology Physician providers enrolled in Maryland, 5 are shown here.
Dr. Jeffrey Abrams
M.D
Clarksville, MD
Dr. Alexander Ambinder
M.D.
Baltimore, MD
Dr. Richard Ambinder
M.D.
Baltimore, MD
Dr. Amir Ameri
MD
Baltimore, MD
Valsamo Anagnostou
MD-PHD
Baltimore, MD
Compare Medical Oncology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Catherine Marshall, MD's specialty? ▼
Catherine Marshall, MD specializes in Medical Oncology Physician and practices in Baltimore, Maryland. Credentials: MD.
How much does Catherine Marshall, MD prescribe under Medicare Part D? ▼
In 2024, Catherine Marshall, MD wrote 458 Medicare Part D claims totaling $1.1M in drug costs for 76 beneficiaries.
What is Catherine Marshall, MD's Medicare quality score? ▼
Catherine Marshall, MD has a CMS MIPS Final Score of 75/100. CMS published no Quality, Promoting Interoperability, Improvement Activity or Cost score for this clinician, so the final score is the neutral performance threshold CMS assigns rather than a measured result. The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Catherine Marshall, MD located? ▼
Catherine Marshall, MD is located at 201 N BROADWAY ST, Baltimore, MD, 21287. Phone: (410) 955-0239.
What is Catherine Marshall, MD's NPI number? ▼
Catherine Marshall, MD's National Provider Identifier (NPI) is 1134443948, issued on 03/23/2010.
Does Catherine Marshall, MD prescribe more brand-name or generic drugs? ▼
Catherine Marshall, MD's prescribing is 23% brand-name and 77% generic drugs by claim count, with $957K in brand drug costs.
Does Catherine Marshall, MD prescribe opioids? ▼
Yes, Catherine Marshall, MD had 15 opioid claims in 2024 with an opioid prescribing rate of 3.3%.
How many Medical Oncology Physician providers are there in the US? ▼
There are 4,028 Medical Oncology Physician providers across 53 states in the US. The average Medical Oncology Physician provider writes 732 Medicare Part D claims per year.
What drugs does Catherine Marshall, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Catherine Marshall, MD's most frequently prescribed drugs include Abiraterone Acetate, Prednisone, Dexamethasone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Catherine Marshall, MD accept Medicare? ▼
Catherine Marshall, MD appears in CMS Medicare data with 458 Part D claims and 76 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Catherine Marshall, MD's credentials? ▼
Catherine Marshall, MD's NPI is 1134443948 with credentials MD. 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 (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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 August 2026 (NPPES) / 2024 (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
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 August 2026.