Physician Profile
Unclaimed ProfileAbout WILLIS
Based in Highlands Ranch, CO, Mark Willis, M.D. is listed in the NPI registry under otolaryngology. Mark graduated from University of Colorado School of Medicine, Denver in 2007. Mark is also listed as specialising in otolaryngology (ent).
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
Common questions
What does Dr. Willis specialise in?
Dr. Willis is an otolaryngology in Highlands Ranch, CO. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “OTOLARYNGOLOGY”.
NPI registry
Where is Dr. Willis located?
Dr. Willis is listed at 1500 PARK CENTRAL DR, Highlands Ranch, CO 80129. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Willis's phone number?
The number on file is (720) 848-0000. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Willis?
Dr. Willis's National Provider Identifier is 1649423617. 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. Willis go to medical school?
Dr. Willis attended University of Colorado School of Medicine, Denver, graduating in 2007. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Willis have?
Dr. Willis has 19 years experience. Calculated from a graduation year of 2007, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Willis do most often?
According to Medicare billing data, Dr. Willis performs procedures including diagnostic exam of voice box using a flexible endoscope, diagnostic exam of nasal passages using an endoscope and removal of impacted ear wax; provides treatments such as exam of ear using a microscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Willis's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Willis. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (720) 848-0000
- Email not available
Practice Locations
1500 PARK CENTRAL DR
Highlands Ranch, CO 80129
Procedures Most Often Billed to Medicare
692 services · 601 patients · 9 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Diagnostic exam of voice box using a flexible endoscope | Procedure | 31575 |
78 |
| Diagnostic exam of nasal passages using an endoscope | Procedure | 31231 |
63 |
| Removal of impacted ear wax | Procedure | 69210 |
60 |
| Fine needle aspiration biopsy using ultrasound guidance, first growth | Procedure | 10005 |
21 |
| Exam of ear using a microscope | Treatment | 92504 |
18 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
161 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
129 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
98 |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
64 |
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 otolaryngology specialists at this location 1
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 otolaryngology specialists in Highlands Ranch 3
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at University of Colorado School of Medicine, Denver 8
Other providers in the same specialty who trained at the same institution.
Class of 2007 at University of Colorado School of Medicine, Denver 8
Providers who graduated from the same medical school in the same year.
Also performs Diagnostic exam of voice box using a flexible endoscope 8
Providers in CO who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.