Dr. Donald B. Longjohn, MD

Dr. Longjohn practices at Keck Hospital of USC in Los Angeles, California, part of University of Southern California.

Dr. Longjohn's NPI, 1215949524, was assigned on August 13, 2006. Dr. Longjohn graduated from University Of Michigan Medical School in 1990. Dr. Longjohn holds California license G72658.

Dr. Longjohn's primary practice is Keck Hospital of USC, at 1500 San Pablo Street, Los Angeles, CA 90033 in Los Angeles County. The practice phone is (323) 442-8656.

Dr. Longjohn's primary practice is Keck Hospital of USC in Los Angeles, California, part of University of Southern California. Dr. Longjohn is also affiliated with Adventist Health Glendale. The medical group on file is USC Care Medical Group. Dmand AI also links Dr. Longjohn to 2 more hospitals, 4 home health agencies, 2 group practices and clinics, 1 other site, 1 urgent care center and 1 medical group, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Longjohn practices, 12 sites in all. Vendor and product names are available with a free account.

Adult reconstructive orthopaedic surgery is Dr. Longjohn's primary specialty in the NPI Registry, under taxonomy code 207XS0114X. Dr. Longjohn is board certified in orthopaedic surgery by the American Board of Orthopaedic Surgery. Dr. Longjohn is licensed in California.

Dmand AI lists arthritis, bursitis, fluid in a joint, hip replacement, joint pain, knee injury, knee replacement and lower back pain among the conditions Dr. Longjohn treats.

CMS data shows 957 Medicare services from Dr. Longjohn across 9 procedure codes in 2024, for 513 Medicare patients. Medicare paid $109,841 for them. Every service was in a facility, such as a hospital, rather than an office.

CMS counts 513 Medicare patients who saw Dr. Longjohn in 2024. The largest group is 65 to 74, with 233 patients. 75% of them have arthritis, and 75% have high blood pressure. 47% are also on Medicaid. Their average risk score is 1.55, 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. Longjohn's median patient age at 72, with 66% women.

In 2024, Dr. Longjohn wrote 236 Medicare Part D claims for 102 patients. 99% of them were for generic drugs. CMS names the drug for 160 of them, across 6 drugs with 11 or more claims each, at $3,911 in total drug cost. In 2023, CMS named 171 claims across 4 drugs.

Dr. Longjohn accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Longjohn as offering telehealth. CMS counts 55 procedures of knee replacement by Dr. Longjohn, more than 81% of the clinicians it reports for that procedure.

Dmand AI links 4 papers to Dr. Longjohn, published from 2016 to 2022. 2021 was the busiest year, with 2. Dr. Longjohn's most frequent co-authors are Soheil Najibi, MD, PhD, Alexander Bryant Christ, MD and Nathanael David Heckmann, MD.

Dmand AI links Dr. Longjohn to 1 clinical trial.

CMS Open Payments shows 32 general payments to Dr. Longjohn from 9 drug and device companies from 2017 to 2025. Consulting fees make up the largest share, 55% of the total. KCI USA, Inc. paid the most, $2,525.

Dmand AI lists 3 awards for Dr. Longjohn, most recently Top Doctors:LA Area in 2013.

Dr. Longjohn graduated from University Of Michigan Medical School in 1990. Dr. Longjohn is a member of ACS.

Dr. Longjohn is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.