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Dr. Gretchen Ann Diemer, MD
NPI1164457289PAC ID2668447624
- Medicare services, 2024
- 169
- Medicare patients, 2024
- 54
- Publications
- 26
- Hospital affiliations
- 2
- Medical groups
- 2
- Practice address
- 5800 Ridge Ave, Philadelphia, PA 19128
- Practice phone
- Call (215) 483-9900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Diemer's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Gretchen Ann Diemer is an internist in Philadelphia, Pennsylvania
Dr. Diemer practices at Roxborough Memorial Hospital in Philadelphia, Pennsylvania, part of Prime Healthcare Services.
Dr. Diemer's NPI, 1164457289, was assigned on July 11, 2006. Dr. Diemer graduated from University of Virginia School of Medicine in 2001. Dr. Diemer holds Pennsylvania license MD424123.
NPI and contact details
- NPI
- 1164457289NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2668447624
- NPI enumeration date
- July 11, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (215) 483-9900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gretchen Ann Diemer practices at 2 locations in Philadelphia, Pennsylvania
Dr. Diemer's primary practice is Roxborough Memorial Hospital, at 5800 Ridge Ave, Philadelphia, PA 19128 in Philadelphia County. The practice phone is (215) 483-9900. Dr. Diemer also practices at Roxborough Memorial Hospital, 5801 Ridge Ave, Philadelphia, PA 19128.
- Roxborough Memorial HospitalPrimary5800 Ridge Ave, Philadelphia, PA 19128 · Philadelphia CountyPhone(215) 483-9900
- Roxborough Memorial Hospital5801 Ridge Ave, Philadelphia, PA 19128 · Philadelphia CountyPhone(215) 487-4245
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Gretchen Ann Diemer is affiliated with 2 sites of care and 2 medical groups
Dr. Diemer's primary practice is Roxborough Memorial Hospital in Philadelphia, Pennsylvania, part of Prime Healthcare Services. Dr. Diemer is also affiliated with Temple University Hospital. The medical group on file is Jefferson University Physicians. Dmand AI also links Dr. Diemer to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gretchen Ann Diemer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Diemer practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Roxborough Memorial Hospital | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Gretchen Ann Diemer is one of 5,665 internists in Pennsylvania
Internal medicine is Dr. Diemer's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Diemer is licensed in Pennsylvania.
Specialties and state licenses
- Internal medicine, PennsylvaniaPrimary
Internists near Dr. Diemer
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
5,665internists in Pennsylvania1,334internists in Philadelphia8internists at Roxborough Memorial Hospital
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gretchen Ann Diemer billed Medicare for 169 services in 2024
CMS data shows 169 Medicare services from Dr. Diemer across 4 procedure codes in 2024, for 54 Medicare patients. Medicare paid $12,985 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2024169
Medicare patients54
Paid by Medicare$12,985
Procedure codes4
Dr. Diemer's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1192024: 16942%
Dr. Diemer compared with the Pennsylvania median for internists, 2024
- Dr. Diemer
- Pennsylvania median
- Medicare services
- 169vs 41759% below
- Medicare patients
- 54vs 18571% below
Medians across 5,518 internists in Pennsylvania with Dmand AI profiles that report each measure.
Dr. Diemer'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.
Need commercial claims for Dr. Diemer?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Diemer and other internists in Pennsylvania.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gretchen Ann Diemer treated 54 Medicare patients in 2024, average age 73
CMS counts 54 Medicare patients who saw Dr. Diemer in 2024. The largest group is 75 to 84, with 17 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 43% are also on Medicaid. Their average risk score is 3.93, 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. Diemer's median patient age at 65, with 47% women.
Medicare patients, 202454
Average age73
Average risk score3.93
Also on Medicaid43%
Dr. Diemer's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Diemer's Medicare patients by sex, 2024
- Women2444%
- Men3056%
Chronic conditions among Dr. Diemer's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease65%
- Chronic kidney disease63%
- Arthritis61%
- Diabetes52%
- Heart failure46%
- Mood disorders46%
Share of Medicare patients with each condition. A patient can have several.
Dr. Diemer's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women47%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. Gretchen Ann Diemer takes part in Medicare
Dr. Diemer accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Gretchen Ann Diemer has 26 publications on record
Dmand AI links 26 papers to Dr. Diemer, published from 2011 to 2025. 2019 was the busiest year, with 5. The most frequent topics are Internship and Residency, Education, Medical, Graduate and Clinical Competence. Dr. Diemer has published most often in Acad Med. Dr. Diemer's most frequent co-authors are Rebecca Jaffe, MD, Calvin Chou, MD, PhD and Kimberly Louise Clinite, MD.
Papers26
Years published2011 to 2025
Dr. Diemer's papers by year, 2011 to 2025
Topics Dr. Diemer writes about most
- Internship and Residency
- Education, Medical, Graduate
- Clinical Competence
- Curriculum
- Career Choice
- Internal Medicine
- Quality Improvement
- Students, Medical
Dr. Diemer's most frequent co-authors
- Rebecca Jaffe, MD8 shared papers
- Calvin Chou, MD, PhD3 shared papers
- Kimberly Louise Clinite, MD3 shared papers
Recent publications by Dr. Diemer
AccreditationClinical CompetenceCurriculum
Career ChoiceClinical CompetenceEducation, Medical, Graduate
J Gen Intern Med
CurriculumDelivery of Health CareEducation, Medical, Graduate
See who Dr. Diemer researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Diemer works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gretchen Ann Diemer graduated from University of Virginia School of Medicine
Dr. Diemer graduated from University of Virginia School of Medicine in 2001.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gretchen Ann Diemer'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 Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Gretchen Ann Diemer
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. Gretchen Ann Diemer's NPI number?
Dr. Gretchen Ann Diemer's NPI number is 1164457289. It was assigned on July 11, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gretchen Ann Diemer?
Dr. Gretchen Ann Diemer is an internist in Philadelphia, Pennsylvania. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Gretchen Ann Diemer practice?
Dr. Diemer practices at 5800 Ridge Ave, Philadelphia, PA 19128. Dr. Diemer also practices at 5801 Ridge Ave, Philadelphia, PA 19128. Dr. Diemer's primary practice is Roxborough Memorial Hospital in Philadelphia, Pennsylvania, part of Prime Healthcare Services. Dmand AI also links Dr. Diemer to 1 medical group.
What is Dr. Gretchen Ann Diemer's office phone number?
The practice phone on file for Dr. Diemer is (215) 483-9900.
What is Dr. Gretchen Ann Diemer's medical license number?
Dr. Diemer holds Pennsylvania license MD424123.
Which hospitals is Dr. Gretchen Ann Diemer affiliated with?
Dr. Diemer practices at Roxborough Memorial Hospital in Philadelphia, Pennsylvania. Dr. Diemer is also affiliated with Temple University Hospital.
What medical group is Dr. Gretchen Ann Diemer part of?
Dr. Diemer is linked to Jefferson University Physicians. Dmand AI links Dr. Diemer to 1 more medical group.
Does Dr. Gretchen Ann Diemer accept Medicare?
Yes. CMS data shows Dr. Diemer billed Medicare for 169 services in 2024, and Dr. Diemer accepts Medicare assignment.
How many Medicare patients does Dr. Gretchen Ann Diemer see?
CMS counts 54 Medicare patients who saw Dr. Diemer in 2024, with an average age of 73.
What services does Dr. Gretchen Ann Diemer bill to Medicare?
In 2024, Dr. Diemer's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99233) and hospital inpatient care (99238).
Show 4 more questionsShow fewer questions
Where did Dr. Gretchen Ann Diemer go to medical school?
Dr. Diemer graduated from University of Virginia School of Medicine in 2001.
How long has Dr. Gretchen Ann Diemer been practicing?
Dr. Diemer graduated from medical school in 2001, 25 years ago.
Does Dr. Gretchen Ann Diemer do research?
Dmand AI links 26 publications to Dr. Diemer, published from 2011 to 2025.
Who does Dr. Gretchen Ann Diemer publish with?
Dr. Diemer's most frequent co-authors are Rebecca Jaffe, MD (8 shared papers), Calvin Chou, MD, PhD (3 shared papers) and Kimberly Louise Clinite, MD (3 shared papers).
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