Dr. Nicholas L. Hartog, MD

Dr. Hartog practices at Corewell Health Grand Rapids Hospitals - Butterworth in Grand Rapids, Michigan, part of Corewell Health.

Dr. Hartog's NPI, 1669766325, was assigned on May 30, 2011. Dr. Hartog graduated from Medical College of Wisconsin in 2011. Dr. Hartog holds Michigan license 4301108955.

Dr. Hartog's primary practice is Corewell Health Grand Rapids Hospitals - Butterworth, at 100 Michigan St NE, Grand Rapids, MI 49503 in Kent County. The practice phone is (616) 391-1774.

Dr. Hartog's primary practice is Corewell Health Grand Rapids Hospitals - Butterworth in Grand Rapids, Michigan, part of Corewell Health. Dr. Hartog is also affiliated with Corewell Health Ludington Hospital. The medical group on file is Corewell Health Medical Group West. Dmand AI also links Dr. Hartog to 2 more group practices and clinics and 1 medical group, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hartog practices, 4 sites in all. Vendor and product names are available with a free account.

Allergy and immunology is Dr. Hartog's primary specialty in the NPI Registry, under taxonomy code 207K00000X. Dmand AI has Dr. Hartog's licenses on file in 3 states: Michigan, Iowa and Missouri.

CMS data shows 112 Medicare services from Dr. Hartog across 5 procedure codes in 2024, for 59 Medicare patients. Medicare paid $8,400 for them. Every service was in an office.

CMS counts 59 Medicare patients who saw Dr. Hartog in 2024. The largest group is 65 to 74, with 28 patients. 69% of them have high cholesterol, and 56% have high blood pressure. 22% are also on Medicaid. Their average risk score is 2.67, 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. Hartog's median patient age at 24, with 56% women.

In 2024, Dr. Hartog wrote 356 Medicare Part D claims for 68 patients. 71% of them were for generic drugs. CMS names the drug for 263 of them, across 13 drugs with 11 or more claims each, at $1,575,880 in total drug cost. In 2023, CMS named 216 claims across 11 drugs.

Dr. Hartog accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Hartog as offering telehealth.

Dmand AI links 36 papers to Dr. Hartog, published from 2014 to 2025. 2020 was the busiest year, with 9. The most frequent topics are COVID-19, SARS-CoV-2 and Pandemics. Dr. Hartog has published most often in Ann Allergy Asthma Immunol. Dr. Hartog's most frequent co-authors are Caleb Patrick Bupp, MD, Matthew Jason Greenhawt, MBA, MD and Jay Adam Lieberman, MD.

CMS Open Payments shows 860 general payments to Dr. Hartog from 31 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 34% of the total. Pharming Healthcare, Inc. paid the most, $165,748. It also lists 1 research payment totaling $2,763 in 2022.

Dr. Hartog graduated from Medical College of Wisconsin in 2011.