Dr. John I. Siekierka, DO
- Medicare services, 2024
- 705
- Medicare patients, 2024
- 449
- Part D claims, 2024
- 302
- Hospital affiliations
- 1
- Industry payments
- $968
- Practice address
- 63 Church St, Flemington, NJ 08822
- Practice phone
- Call (908) 237-4036
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Hunterdon Health Urgent Care at Flemington
Urgent Care Center · Flemington, New Jersey
Find Dr. Siekierka'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. John I. Siekierka is an emergency medicine physician in Flemington, New Jersey
Dr. Siekierka practices at Hunterdon Health Urgent Care at Flemington in Flemington, New Jersey.
Dr. Siekierka's NPI, 1134175292, was assigned on May 26, 2006. Dr. Siekierka graduated from Philadelphia College of Osteopathic Medicine in 1988. Dr. Siekierka holds New Jersey license 25MB05718100.
- NPI
- 1134175292NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0941272942
- NPI enumeration date
- May 26, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (908) 237-4036
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John I. Siekierka practices at Hunterdon Health Urgent Care at Flemington in Flemington, New Jersey
Dr. Siekierka's primary practice is Hunterdon Health Urgent Care at Flemington, at 63 Church St, Flemington, NJ 08822. The practice phone is (908) 237-4036.
- Hunterdon Health Urgent Care at Flemington63 Church St, Flemington, NJ 08822Phone(908) 237-4036
Source: Dmand AI Affiliation Data
Dr. John I. Siekierka is affiliated with 3 sites of care and 4 medical groups
Dr. Siekierka's primary practice is Hunterdon Health Urgent Care at Flemington in Flemington, New Jersey. Dr. Siekierka is also affiliated with Hunterdon Medical Center. The medical group on file is Hunterdon Health. Dmand AI also links Dr. Siekierka to 3 more medical groups and 1 group practice or clinic, each named with a free account. Dr. Siekierka's employer is on file too: an urgent care center.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John I. Siekierka's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Siekierka practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Hunterdon Health Urgent Care at Flemington | Available with a free account |
| +2 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John I. Siekierka is one of 1,548 emergency medicine physicians in New Jersey
Emergency medicine is Dr. Siekierka's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Siekierka is licensed in New Jersey.
Specialties and state licenses
- Emergency medicine, New JerseyPrimary
Emergency medicine physicians near Dr. Siekierka
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John I. Siekierka billed Medicare for 705 services in 2024
CMS data shows 705 Medicare services from Dr. Siekierka across 11 procedure codes in 2024, for 449 Medicare patients. Medicare paid $38,441 for them. Every service was in an office.
Dr. Siekierka's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6672024: 47030%
- Lab and pathology
- 2023: 1202024: 10017%
- Imaging
- 2023: 1072024: 8421%
- Tests and treatments
- 2023: 682024: 4041%
- Surgery
- 2023: 142024: 1121%
Dr. Siekierka compared with the New Jersey median for emergency medicine physicians, 2024
- Dr. Siekierka
- New Jersey median
- Medicare services
- 705vs 3262.2 times
- Medicare patients
- 449vs 32140% above
- Part D claims
- 230vs 474.9 times
Medians across 1,494 emergency medicine physicians in New Jersey with Dmand AI profiles that report each measure.
Dr. Siekierka'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. Siekierka?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Siekierka and other emergency medicine physicians in New Jersey.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John I. Siekierka treated 449 Medicare patients in 2024, average age 73
CMS counts 449 Medicare patients who saw Dr. Siekierka in 2024. The largest group is 65 to 74, with 205 patients. 75% of them have high cholesterol, and 65% have high blood pressure. 10% are also on Medicaid. Their average risk score is 0.98, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Siekierka's median patient age at 40, with 57% women.
Dr. Siekierka's Medicare patients by age, 2024
Dr. Siekierka's Medicare patients by sex, 2024
- Women28764%
- Men16236%
Chronic conditions among Dr. Siekierka's Medicare patients, 2024
- High cholesterol75%
- High blood pressure65%
- Arthritis38%
- Ischemic heart disease27%
- Diabetes23%
- Anxiety21%
- Mood disorders21%
- Depression17%
Share of Medicare patients with each condition. A patient can have several.
Dr. Siekierka's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 40
Patient panel by sex, all payers
- Women57%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John I. Siekierka wrote 302 Medicare Part D claims in 2024
In 2024, Dr. Siekierka wrote 302 Medicare Part D claims for 256 patients. 89% of them were for generic drugs. CMS names the drug for 230 of them, across 9 drugs with 11 or more claims each, at $1,341 in total drug cost. In 2023, CMS named 286 claims across 9 drugs.
Dr. Siekierka's Part D claims by kind of drug, 2024
- Generic268 claims89%
- Brand-name and other34 claims11%
Dr. Siekierka's 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. Siekierka's Part D claims, 2024
- Antibiotics63%189 of 302 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: 2862024: 23020%
Drugs named by CMS: 9 in 2024, 9 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. John I. Siekierka takes part in Medicare
Dr. Siekierka 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)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. John I. Siekierka received $968 in industry payments from 2018 to 2025
CMS Open Payments shows 10 general payments to Dr. Siekierka from 8 drug and device companies from 2018 to 2025. Food and beverage make up the largest share, 100% of the total. Amgen Inc. paid the most, $246.
General payments to Dr. Siekierka by program year, 2018 to 2025
Companies that paid Dr. Siekierka the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John I. Siekierka graduated from Philadelphia College of Osteopathic Medicine
Dr. Siekierka graduated from Philadelphia College of Osteopathic Medicine in 1988.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John I. Siekierka'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 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) |
| 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. John I. Siekierka
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. John I. Siekierka's NPI number?
Dr. John I. Siekierka's NPI number is 1134175292. It was assigned on May 26, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John I. Siekierka?
Dr. John I. Siekierka is an emergency medicine physician in Flemington, New Jersey. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. John I. Siekierka practice?
Dr. Siekierka practices at 63 Church St, Flemington, NJ 08822. Dr. Siekierka's primary practice is Hunterdon Health Urgent Care at Flemington in Flemington, New Jersey. Dmand AI also links Dr. Siekierka to 3 medical groups and 1 group practice or clinic.
What is Dr. John I. Siekierka's office phone number?
The practice phone on file for Dr. Siekierka is (908) 237-4036.
What is Dr. John I. Siekierka's medical license number?
Dr. Siekierka holds New Jersey license 25MB05718100.
Which hospitals is Dr. John I. Siekierka affiliated with?
Dr. Siekierka is affiliated with Hunterdon Medical Center.
What medical group is Dr. John I. Siekierka part of?
Dr. Siekierka is linked to Hunterdon Health. Dmand AI links Dr. Siekierka to 3 more medical groups.
Does Dr. John I. Siekierka accept Medicare?
Yes. CMS data shows Dr. Siekierka billed Medicare for 705 services in 2024, and Dr. Siekierka accepts Medicare assignment.
How many Medicare patients does Dr. John I. Siekierka see?
CMS counts 449 Medicare patients who saw Dr. Siekierka in 2024, with an average age of 73.
What services does Dr. John I. Siekierka bill to Medicare?
In 2024, Dr. Siekierka's most billed Medicare services were office visit, established patient (99213), office visit, new patient (99203) and lab and pathology test (81002).
Show 4 more questionsShow fewer questions
Where did Dr. John I. Siekierka go to medical school?
Dr. Siekierka graduated from Philadelphia College of Osteopathic Medicine in 1988.
What drugs does Dr. John I. Siekierka prescribe most?
In 2024 Medicare Part D data, Dr. Siekierka's most prescribed drugs by claims were Cephalexin, Azithromycin and Prednisone.
Has Dr. John I. Siekierka received payments from drug or device companies?
CMS Open Payments shows $968 in general payments to Dr. Siekierka from 8 companies from 2018 to 2025. The largest total came from Amgen Inc.
How long has Dr. John I. Siekierka been practicing?
Dr. Siekierka graduated from medical school in 1988, 38 years ago.
Selling to emergency medicine practices?
See emergency medicine physicians in New Jersey by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card