Physician Profile
Unclaimed ProfileAbout BRENNAN
Daniel M Brennan, OD practices optometry in Chicago, IL. Daniel is also listed as specializing in optometrist. According to Medicare claims data, Daniel cared for 118 Medicare patients across 124 services.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (312) 819-0199
- Email not available
Practice Locations
225 N MICHIGAN AVE
Chicago, IL 60601
Procedures Most Often Billed to Medicare
124 services · 118 patients · 4 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Photography of the retina | Treatment | 92250 |
49 |
| Established patient complete exam of visual system | Treatment | 92014 |
37 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
24 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
14 |
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.
Other optometry specialists at this location 3
Same specialty, same street address — most likely the same department or group.
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 optometry specialists in Chicago 7
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2017 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Photography of the retina 8
Providers in IL who bill this service to Medicare most often.
Common questions
What does Dr. Brennan specialize in?
Dr. Brennan is an optometry in Chicago, IL. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “OPTOMETRY”.
NPI registry
Where is Dr. Brennan located?
Dr. Brennan is listed at 225 N MICHIGAN AVE, Chicago, IL 60601. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Brennan's phone number?
The number on file is (312) 819-0199. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Brennan's NPI number?
Dr. Brennan's National Provider Identifier is 1770006736. 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. Brennan go to medical school?
Dr. Brennan attended Other, graduating in 2017. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Brennan been practicing?
Dr. Brennan has 9 years experience. Calculated from a graduation year of 2017, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Brennan do most often?
According to Medicare billing data, Dr. Brennan provides treatments such as photography of the retina and established patient complete exam of visual system, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Brennan confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Brennan. If this is you, claiming it is free.
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Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.