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Dr. Katherine Amalia Loomis, MD
NPI1255835989
- Part D claims, 2024
- 294
- Publications
- 1
- Hospital affiliations
- 1
- Industry payments
- $657
- State license
- 1
- Practice address
- 2051 Marengo St, Room C2K100, Los Angeles, CA 90033
- Practice phone
- Call (323) 226-2800
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Loomis' 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. Katherine Amalia Loomis is an internist in Los Angeles, California
Dr. Loomis practices at Los Angeles General Medical Center in Los Angeles, California, part of County of Los Angeles.
Dr. Loomis' NPI, 1255835989, was assigned on March 19, 2018. Dr. Loomis holds California license A164585.
NPI and contact details
- NPI
- 1255835989NPI Registry (opens in a new tab)
- NPI enumeration date
- March 19, 2018
- NPI status
- Active
- Practice phone
- (323) 226-2800
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Katherine Amalia Loomis practices at Los Angeles General Medical Center in Los Angeles, California
Dr. Loomis' primary practice is Los Angeles General Medical Center, at 2051 Marengo St, Room C2K100, Los Angeles, CA 90033 in Los Angeles County. The practice phone is (323) 226-2800.
- Los Angeles General Medical Center2051 Marengo St, Room C2K100, Los Angeles, CA 90033 · Los Angeles CountyPhone(323) 226-2800
Source: Dmand AI Affiliation Data
Dr. Katherine Amalia Loomis is affiliated with 1 site of care
Dr. Loomis' primary practice is Los Angeles General Medical Center in Los Angeles, California, part of County of Los Angeles. Dr. Loomis' employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Katherine Amalia Loomis' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Loomis practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Los Angeles General Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Katherine Amalia Loomis is one of 16,751 internists in California
Internal medicine is Dr. Loomis' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Loomis is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Loomis
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
16,751internists in California1,242internists in Los Angeles110internists at Los Angeles General Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Katherine Amalia Loomis' patients have a median age of 50
Across all payers, Dmand AI patient panel data puts Dr. Loomis' median patient age at 50, with 46% women.
Dr. Loomis' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 50
Patient panel by sex, all payers
- Women46%
- Men54%
Source: Dmand AI Patient Panel Data
Dr. Katherine Amalia Loomis wrote 294 Medicare Part D claims in 2024
In 2024, Dr. Loomis wrote 294 Medicare Part D claims for 43 patients. 74% of them were for generic drugs. CMS names the drug for 88 of them, across 6 drugs with 11 or more claims each, at $60,998 in total drug cost. In 2021, CMS named 11 claims across 1 drug.
Part D claims, 2024294
Drugs named by CMS6
Total drug cost$60,998
Part D patients43
Dr. Loomis' Part D claims by kind of drug, 2024
- Generic218 claims74%
- Brand-name and other76 claims26%
Dr. Loomis' 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, 2021 to 2024
- 2021
- 2024
- Claims for drugs CMS names
- 2021: 112024: 88700%
Drugs named by CMS: 6 in 2024, 1 in 2021.
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
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Dr. Katherine Amalia Loomis has 1 publication on record
Dmand AI links 1 paper to Dr. Loomis in 2012.
Papers1
Recent publications by Dr. Loomis
See who Dr. Loomis researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Loomis 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. Katherine Amalia Loomis received $657 in industry payments from 2023 to 2025
CMS Open Payments shows 16 general payments to Dr. Loomis from 4 drug and device companies from 2023 to 2025. Food and beverage make up the largest share, 88% of the total. Gilead Sciences, Inc. paid the most, $385.
General payments to Dr. Loomis by program year, 2023 to 2025
General payments to Dr. Loomis by kind, 2023 to 2025
$657in total
- Food and beverage$57888%
- Education$8012%
Companies that paid Dr. Loomis the most, 2023 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Katherine Amalia Loomis'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Katherine Amalia Loomis
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. Katherine Amalia Loomis' NPI number?
Dr. Katherine Amalia Loomis' NPI number is 1255835989. It was assigned on March 19, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Katherine Amalia Loomis?
Dr. Katherine Amalia Loomis is an internist in Los Angeles, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Katherine Amalia Loomis practice?
Dr. Loomis practices at 2051 Marengo St, Room C2K100, Los Angeles, CA 90033. Dr. Loomis' primary practice is Los Angeles General Medical Center in Los Angeles, California, part of County of Los Angeles.
What is Dr. Katherine Amalia Loomis' office phone number?
The practice phone on file for Dr. Loomis is (323) 226-2800.
What is Dr. Katherine Amalia Loomis' medical license number?
Dr. Loomis holds California license A164585.
Which hospitals is Dr. Katherine Amalia Loomis affiliated with?
Dr. Loomis practices at Los Angeles General Medical Center in Los Angeles, California.
What drugs does Dr. Katherine Amalia Loomis prescribe most?
In 2024 Medicare Part D data, Dr. Loomis' most prescribed drugs by claims were Amlodipine Besylate, Metformin HCl and Biktarvy.
Has Dr. Katherine Amalia Loomis received payments from drug or device companies?
CMS Open Payments shows $657 in general payments to Dr. Loomis from 4 companies from 2023 to 2025. The largest total came from Gilead Sciences, Inc.
How long has Dr. Katherine Amalia Loomis been practicing?
Dr. Loomis' NPI was assigned in 2018.
Does Dr. Katherine Amalia Loomis do research?
Dmand AI links 1 publication to Dr. Loomis.
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