Physician Profile
Nicholas Callahan, MPH DMD MD
Unclaimed ProfileAbout Dr. Callahan
Based in Chicago, IL, Nicholas Callahan, MPH DMD MD is listed in the NPI registry under oral & maxillofacial surgery. Nicholas graduated from State University of New York Downstate Medical Center in 2013. Nicholas is also listed as specializing in oral & maxillofacial surgery (dental). Medicare claims data shows Nicholas provided 80 services to 68 patients. The services billed most often include established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and ct scan of face without contrast.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (312) 413-2379
- Email not available
Practice Locations
801 S PAULINA ST
Chicago, IL 60612
451 Clarkson Ave Dental Clinic
Brooklyn, NY 11203
Procedures Most Often Billed to Medicare
80 services · 68 patients · 4 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Ct scan of face without contrast | Imaging | 70486 |
16 | Too few peers to compare |
| Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more | Office visit | 99212 |
36 | More often than most peers in Oral & Maxillofacial Surgery |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
17 | Less often than most peers in Oral & Maxillofacial Surgery |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
11 | Less often than most peers in Oral & Maxillofacial Surgery |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other oral surgeons in Chicago 8
Same specialty, same city.
More connections — 17 related providers in 3 groups
Trained at State University of New York Downstate Medical Center 1
Other providers in the same specialty who trained at the same institution.
Class of 2013 at State University of New York Downstate Medical Center 8
Providers who graduated from the same medical school in the same year.
Also performs Ct scan of face without contrast 8
Providers in IL who bill this service to Medicare most often.
Common questions
What does Dr. Callahan specialize in?
Dr. Callahan is an oral surgeon in Chicago, IL. That is the designation recorded for this NPI in the federal registry, where it is listed as “Oral & Maxillofacial Surgery”.
NPI registry
Where is Dr. Callahan located?
Dr. Callahan is listed at 801 S Paulina St, Chicago, IL 60612. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Callahan's phone number?
The number on file is (312) 413-2379. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Callahan?
Dr. Callahan's National Provider Identifier is 1083920227. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Callahan go to medical school?
Dr. Callahan attended State University of New York Downstate Medical Center, graduating in 2013. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Callahan have?
Dr. Callahan has 13 years experience. Calculated from a graduation year of 2013, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Callahan do most often?
According to Medicare billing data, Dr. Callahan performs imaging including ct scan of face without contrast, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Callahan's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Callahan. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.