BacteremiaBlood CultureElectronic Health Records
Dr. Zachary Thomas Lonjers, MD
NPI1104205491PAC ID0446562953
- Medicare services, 2024
- 841
- Medicare patients, 2024
- 402
- Part D claims, 2024
- 842
- Publications
- 1
- Hospital affiliations
- 2
- Practice address
- One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110
- Practice phone
- Call (314) 747-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Lonjers' professional email, personal email and mobile number
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Dr. Zachary Thomas Lonjers is a pulmonologist in Saint Louis, Missouri
Dr. Lonjers practices at Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health.
Dr. Lonjers' NPI, 1104205491, was assigned on May 20, 2015. Dr. Lonjers graduated from Loyola University of Chicago, Stritch School of Medicine in 2015. Dr. Lonjers holds Missouri license 2022016251.
NPI and contact details
- NPI
- 1104205491NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0446562953
- NPI enumeration date
- May 20, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (314) 747-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Zachary Thomas Lonjers practices at 2 locations in Saint Louis, Missouri
Dr. Lonjers' primary practice is Barnes-Jewish Hospital, at One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110 in St. Louis City. The practice phone is (314) 747-3000. Dr. Lonjers also practices at Barnes-Jewish Hospital, 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110.
- Barnes-Jewish HospitalPrimaryOne Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110 · St. Louis CityPhone(314) 747-3000
- Barnes-Jewish Hospital1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110 · Saint Louis CityPhone(314) 747-3000
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Zachary Thomas Lonjers is affiliated with 2 sites of care and 1 medical group
Dr. Lonjers' primary practice is Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health. Dr. Lonjers is also affiliated with Barnes-Jewish West County Hospital. The medical group on file is WashU Medicine Psychiatry.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Zachary Thomas Lonjers' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lonjers practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Barnes-Jewish Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Zachary Thomas Lonjers is one of 279 pulmonologists in Missouri
Pulmonary disease is Dr. Lonjers' primary specialty in the NPI Registry, under taxonomy code 207RP1001X. Dr. Lonjers is board certified in critical care medicine by the American Board of Internal Medicine. Dr. Lonjers is licensed in Missouri.
Specialties and state licenses
- Pulmonary disease, MissouriPrimary
Pulmonologists near Dr. Lonjers
Counts of pulmonologists with a Dmand AI profile, by place and practice. Each opens the list.
279pulmonologists in Missouri95pulmonologists in Saint Louis34pulmonologists at Barnes-Jewish Hospital
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Zachary Thomas Lonjers billed Medicare for 841 services in 2024
CMS data shows 841 Medicare services from Dr. Lonjers across 17 procedure codes in 2024, for 402 Medicare patients. Medicare paid $59,060 for them.
Medicare services, 2024841
Medicare patients402
Paid by Medicare$59,060
Procedure codes17
Dr. Lonjers' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1402024: 400186%
- Tests and treatments
- 2023: 02024: 352
- Lab and pathology
- 2023: 02024: 47
- Surgery
- 2023: 02024: 28
- Other services
- 2023: 02024: 14
Where Dr. Lonjers' Medicare services took place, 2024
- In an office65077%
- In a facility19123%
Dr. Lonjers compared with the Missouri median for pulmonologists, 2024
- Dr. Lonjers
- Missouri median
- Medicare services
- 841vs 72816% above
- Medicare patients
- 402vs 33121% above
- Part D claims
- 738vs 730Close to median
Medians across 283 pulmonologists in Missouri with Dmand AI profiles that report each measure.
Dr. Lonjers' 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. Lonjers?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Lonjers and other pulmonologists in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Zachary Thomas Lonjers treated 402 Medicare patients in 2024, average age 70
CMS counts 402 Medicare patients who saw Dr. Lonjers in 2024. The largest group is 65 to 74, with 179 patients. 75% of them have high blood pressure, and 70% have high cholesterol. 18% are also on Medicaid. Their average risk score is 2.46, 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. Lonjers' median patient age at 69, with 54% women.
Medicare patients, 2024402
Average age70
Average risk score2.46
Also on Medicaid18%
Dr. Lonjers' Medicare patients by age, 2024
Dr. Lonjers' Medicare patients by sex, 2024
- Women20952%
- Men19348%
Chronic conditions among Dr. Lonjers' Medicare patients, 2024
- High blood pressure75%
- High cholesterol70%
- COPD52%
- Arthritis50%
- Ischemic heart disease41%
- Chronic kidney disease40%
- Diabetes40%
- Heart failure37%
Share of Medicare patients with each condition. A patient can have several.
Dr. Lonjers' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Zachary Thomas Lonjers wrote 842 Medicare Part D claims in 2024
In 2024, Dr. Lonjers wrote 842 Medicare Part D claims for 158 patients. 43% of them were for generic drugs. CMS names the drug for 738 of them, across 21 drugs with 11 or more claims each, at $233,443 in total drug cost. In 2023, CMS named 65 claims across 4 drugs.
Part D claims, 2024842
Drugs named by CMS21
Total drug cost$233,443
Part D patients158
Dr. Lonjers' Part D claims by kind of drug, 2024
- Generic364 claims43%
- Brand-name478 claims57%
Dr. Lonjers' 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.
Drug classes CMS tracks in Dr. Lonjers' Part D claims, 2024
- Antibiotics7%60 of 842 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 652024: 7381035%
Drugs named by CMS: 21 in 2024, 4 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
How Dr. Zachary Thomas Lonjers takes part in Medicare
Dr. Lonjers 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. Zachary Thomas Lonjers has 1 publication on record
Dmand AI links 1 paper to Dr. Lonjers. Dr. Lonjers' most frequent co-authors are Majid Afshar, MD and Matthew M. Churpek, MD, PhD.
Papers1
Dr. Lonjers' most frequent co-authors
Recent publications by Dr. Lonjers
See who Dr. Lonjers researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Lonjers works with, so you can find a warm path to the right pulmonologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Zachary Thomas Lonjers received $114 in industry payments in 2017
CMS Open Payments shows 1 general payment to Dr. Lonjers from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. Astellas Pharma US Inc paid the most, $114.
Companies that paid Dr. Lonjers the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Zachary Thomas Lonjers graduated from Loyola University of Chicago, Stritch School of Medicine
Dr. Lonjers graduated from Loyola University of Chicago, Stritch School of Medicine in 2015.
- Medical school
- Board certified in critical care medicine
- Board certified in internal medicine
- Board certified in pulmonary disease
Source: Dmand AI Professional Profile Data
Sources for Dr. Zachary Thomas Lonjers'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) |
| 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 | 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 |
| 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. Zachary Thomas Lonjers
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. Zachary Thomas Lonjers' NPI number?
Dr. Zachary Thomas Lonjers' NPI number is 1104205491. It was assigned on May 20, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Zachary Thomas Lonjers?
Dr. Zachary Thomas Lonjers is a pulmonologist in Saint Louis, Missouri. The primary specialty in the NPI Registry is Pulmonary Disease Physician (taxonomy code 207RP1001X).
Where does Dr. Zachary Thomas Lonjers practice?
Dr. Lonjers practices at One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110. Dr. Lonjers also practices at 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110. Dr. Lonjers' primary practice is Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health.
What is Dr. Zachary Thomas Lonjers' office phone number?
The practice phone on file for Dr. Lonjers is (314) 747-3000.
What is Dr. Zachary Thomas Lonjers' medical license number?
Dr. Lonjers holds Missouri license 2022016251.
Which hospitals is Dr. Zachary Thomas Lonjers affiliated with?
Dr. Lonjers practices at Barnes-Jewish Hospital in Saint Louis, Missouri. Dr. Lonjers is also affiliated with Barnes-Jewish West County Hospital.
What medical group is Dr. Zachary Thomas Lonjers part of?
Dr. Lonjers is linked to WashU Medicine Psychiatry.
Does Dr. Zachary Thomas Lonjers accept Medicare?
Yes. CMS data shows Dr. Lonjers billed Medicare for 841 services in 2024, and Dr. Lonjers accepts Medicare assignment.
How many Medicare patients does Dr. Zachary Thomas Lonjers see?
CMS counts 402 Medicare patients who saw Dr. Lonjers in 2024, with an average age of 70.
Is Dr. Zachary Thomas Lonjers board certified?
Yes. Dr. Lonjers is board certified in critical care medicine by the American Board of Internal Medicine.
Show 7 more questionsShow fewer questions
What services does Dr. Zachary Thomas Lonjers bill to Medicare?
In 2024, Dr. Lonjers' most billed Medicare services were office visit, established patient (99214), lung function service (94010) and lung function service (94618).
Where did Dr. Zachary Thomas Lonjers go to medical school?
Dr. Lonjers graduated from Loyola University of Chicago, Stritch School of Medicine in 2015.
What drugs does Dr. Zachary Thomas Lonjers prescribe most?
In 2024 Medicare Part D data, Dr. Lonjers' most prescribed drugs by claims were Trelegy Ellipta, Albuterol Sulfate Hfa and Prednisone.
Has Dr. Zachary Thomas Lonjers received payments from drug or device companies?
CMS Open Payments shows $114 in general payments to Dr. Lonjers from 1 company from 2017 to 2017. The largest total came from Astellas Pharma US Inc.
How long has Dr. Zachary Thomas Lonjers been practicing?
Dr. Lonjers graduated from medical school in 2015, 11 years ago.
Does Dr. Zachary Thomas Lonjers do research?
Dmand AI links 1 publication to Dr. Lonjers.
Who does Dr. Zachary Thomas Lonjers publish with?
Dr. Lonjers' most frequent co-authors are Majid Afshar, MD (1 shared paper) and Matthew M. Churpek, MD, PhD (1 shared paper).
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