Dr. Catherine Simpson, MD
- Medicare services, 2024
- 218
- Medicare patients, 2024
- 104
- Part D claims, 2024
- 170
- MIPS score, 2024
- 83
- Hospital affiliations
- 2
- Practice address
- 600 N Wolfe St, Baltimore, MD 21287
- Practice phone
- Call (855) 662-3017
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Johns Hopkins Hospital Nelson/Harvey Building
Baltimore, Maryland
Find Dr. Simpson's professional email, personal email and mobile number
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Dr. Catherine Simpson is an internist in Baltimore, Maryland
Dr. Simpson practices at Johns Hopkins Hospital Nelson/Harvey Building in Baltimore, Maryland.
Dr. Simpson's NPI, 1134496508, was assigned on November 29, 2011. Dr. Simpson graduated from Louisiana State University School of Medicine in New Orleans in 2012. Dr. Simpson holds Maryland license XXXXXXX.
- NPI
- 1134496508NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1759530595
- NPI enumeration date
- November 29, 2011
- NPI status
- Active
- Practice phone
- (855) 662-3017
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 40
- Medical school graduation
- 2012
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Catherine Simpson practices at Johns Hopkins Hospital Nelson/Harvey Building in Baltimore, Maryland
Dr. Simpson's primary practice is Johns Hopkins Hospital Nelson/Harvey Building, at 600 N Wolfe St, Baltimore, MD 21287 in Baltimore City. The practice phone is (855) 662-3017.
- Johns Hopkins Hospital Nelson/Harvey Building600 N Wolfe St, Baltimore, MD 21287 · Baltimore CityPhone(855) 662-3017
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Catherine Simpson is affiliated with 3 sites of care and 2 medical groups
Dr. Simpson's primary practice is Johns Hopkins Hospital Nelson/Harvey Building in Baltimore, Maryland. Dr. Simpson is also affiliated with The Johns Hopkins Hospital. The medical group on file is Johns Hopkins University. Dmand AI also links Dr. Simpson to 1 more hospital and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Catherine Simpson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Simpson practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Johns Hopkins Hospital Nelson/Harvey Building | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Catherine Simpson is one of 3,320 internists in Maryland
Internal medicine is Dr. Simpson's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Simpson is licensed in Maryland.
Specialties and state licenses
- Internal medicine, MarylandPrimary
Internists near Dr. Simpson
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Catherine Simpson billed Medicare for 218 services in 2024
CMS data shows 218 Medicare services from Dr. Simpson across 6 procedure codes in 2024, for 104 Medicare patients. Medicare paid $18,555 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Simpson's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 722024: 172139%
- Other services
- 2023: 02024: 46
Dr. Simpson compared with the Maryland median for internists, 2024
- Dr. Simpson
- Maryland median
- Medicare services
- 218vs 65667% below
- Medicare patients
- 104vs 25159% below
- Part D claims
- 122vs 30961% below
Medians across 3,215 internists in Maryland with Dmand AI profiles that report each measure.
Dr. Simpson's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Simpson and other internists in Maryland.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Catherine Simpson treated 104 Medicare patients in 2024, average age 69
CMS counts 104 Medicare patients who saw Dr. Simpson in 2024. The largest group is 65 to 74, with 44 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 33% are also on Medicaid. Their average risk score is 4.09, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Simpson's median patient age at 73, with 77% women.
Dr. Simpson's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Simpson's Medicare patients by sex, 2024
- Women7572%
- Men2928%
Chronic conditions among Dr. Simpson's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis61%
- Heart failure61%
- Chronic kidney disease55%
- COPD52%
- Ischemic heart disease49%
- Diabetes45%
Share of Medicare patients with each condition. A patient can have several.
Dr. Simpson's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women77%
- Men23%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Catherine Simpson wrote 170 Medicare Part D claims in 2024
In 2024, Dr. Simpson wrote 170 Medicare Part D claims for 28 patients. 73% of them were for generic drugs. CMS names the drug for 122 of them, across 4 drugs with 11 or more claims each, at $529,249 in total drug cost. In 2023, CMS named 79 claims across 3 drugs.
Dr. Simpson's Part D claims by kind of drug, 2024
- Generic124 claims73%
- Brand-name46 claims27%
Dr. Simpson's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 792024: 12254%
Drugs named by CMS: 4 in 2024, 3 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Catherine Simpson scored 83 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 83 out of 100 for Dr. Simpson for performance year 2024, reported as part of a group.
Dr. Simpson's MIPS scores, performance year 2024
- 83of 100Final score
- 73.9of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 70of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Catherine Simpson received $139 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Simpson from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Actelion Pharmaceuticals US, Inc. paid the most, $139.
Companies that paid Dr. Simpson the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Catherine Simpson graduated from Louisiana State University School of Medicine in New Orleans
Dr. Simpson graduated from Louisiana State University School of Medicine in New Orleans in 2012.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Catherine Simpson's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Catherine Simpson
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Catherine Simpson's NPI number?
Dr. Catherine Simpson's NPI number is 1134496508. It was assigned on November 29, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. Catherine Simpson?
Dr. Catherine Simpson is an internist in Baltimore, Maryland. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Catherine Simpson practice?
Dr. Simpson practices at 600 N Wolfe St, Baltimore, MD 21287. Dr. Simpson's primary practice is Johns Hopkins Hospital Nelson/Harvey Building in Baltimore, Maryland. Dmand AI also links Dr. Simpson to 1 hospital and 1 medical group.
What is Dr. Catherine Simpson's office phone number?
The practice phone on file for Dr. Simpson is (855) 662-3017.
What is Dr. Catherine Simpson's medical license number?
Dr. Simpson holds Maryland license XXXXXXX.
Which hospitals is Dr. Catherine Simpson affiliated with?
Dr. Simpson is affiliated with The Johns Hopkins Hospital. Dmand AI links Dr. Simpson to 1 more hospital.
What medical group is Dr. Catherine Simpson part of?
Dr. Simpson is linked to Johns Hopkins University. Dmand AI links Dr. Simpson to 1 more medical group.
Does Dr. Catherine Simpson accept Medicare?
Yes. CMS data shows Dr. Simpson billed Medicare for 218 services in 2024.
What is Dr. Catherine Simpson's MIPS score?
Dr. Simpson's MIPS final score for performance year 2024 is 83 out of 100, reported as part of a group.
How many Medicare patients does Dr. Catherine Simpson see?
CMS counts 104 Medicare patients who saw Dr. Simpson in 2024, with an average age of 69.
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What services does Dr. Catherine Simpson bill to Medicare?
In 2024, Dr. Simpson's most billed Medicare services were hospital inpatient care (99233), medicare service (G2211) and office visit, established patient (99214).
Where did Dr. Catherine Simpson go to medical school?
Dr. Simpson graduated from Louisiana State University School of Medicine in New Orleans in 2012.
What drugs does Dr. Catherine Simpson prescribe most?
In 2024 Medicare Part D data, Dr. Simpson's most prescribed drugs by claims were Ambrisentan, Furosemide and Tadalafil.
Has Dr. Catherine Simpson received payments from drug or device companies?
CMS Open Payments shows $139 in general payments to Dr. Simpson from 1 company from 2025 to 2025. The largest total came from Actelion Pharmaceuticals US, Inc.
How long has Dr. Catherine Simpson been practicing?
Dr. Simpson graduated from medical school in 2012, 14 years ago.
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