WILLIAM MICHAEL BRENNAN SR. DDS
NPI 1235142746
Dentist in Downers Grove, IL
NPI Status: Active since August 14, 2006
Contact Information
5133 WASHINGTON ST
DOWNERS GROVE, IL
ZIP 60515
Phone: (630) 969-4645
- Individual
- Male
- Dentist
- PECOS Enrolled
- CLIA Number: 14D2245648
- CLIA Cert. Type: Practitioner Other
- CLIA Exp. Date: 12-14-2025
About WILLIAM BRENNAN
This page provides the complete NPI Profile along with additional information for William Brennan, a provider established in Downers Grove, Illinois with a medical specialization in Dentist. The healthcare provider is registered in the NPI registry with number 1235142746 assigned on August 2006. The practitioner's primary taxonomy code is 122300000X with license number 19A15602 (IL). The provider is registered as an individual and his NPI record was last updated 18 years ago.
- NPI
- 1235142746
- Provider Name
- WILLIAM MICHAEL BRENNAN SR. DDS
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 5133 WASHINGTON ST DOWNERS GROVE, IL 60515
- Location Phone
- (630) 969-4645
- Mailing Address
- 5133 WASHINGTON ST DOWNERS GROVE, IL 60515
- Mailing Phone
- (630) 969-4645
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 08-14-2006
- Last Update Date
- 07-08-2007
- Code Navigator
A dentist like William Brennan is a skilled in and licensed provider that diagnoses and treats problems with patients teeth, gums, and related parts of the mouth. Dentists educate patients on how to take care of the teeth and gums and provide information on diet choices that affect oral health. Dentists must be licensed in the state in which they work.
Location Map
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Dentist
- Taxonomy Code
- 122300000X
- Type
- Dental Providers
- License No.
- 19A15602
- License State
- IL
- Taxonomy Description
- A dentist is a person qualified by a doctorate in dental surgery (D.D.S.) or dental medicine (D.M.D.), licensed by the state to practice dentistry, and practicing within the scope of that license. There is no difference between the two degrees: dentists who have a DMD or DDS have the same education. Universities have the prerogative to determine what degree is awarded. Both degrees use the same curriculum requirements set by the American Dental Association's Commission on Dental Accreditation. Generally, three or more years of undergraduate education plus four years of dental school is required to graduate and become a general dentist. State licensing boards accept either degree as equivalent, and both degrees allow licensed individuals to practice the same scope of general dentistry. Additional post-graduate training is required to become a dental specialist.
Medicare Participation & PECOS Enrollment Status
William Brennan is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME) and a Home Health Agency (HHA).
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Is the provider registered in PECOS? Yes
Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): Yes
Eligible to Order or Refer Power Mobility Devices: No
Physician Visit Costs
The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.
For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.
The prices below reflect the costs for new and established patients in the 60515 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is 99203
- Average New Patient Price $93.02
- Minimum New Patient Price $59.81
- Maximum New Patient Price $181.38
- Average New Patient Copayment $23.25
- Minimum New Patient Copayment $14.95
- Maximum New Patient Copayment $45.34
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99213
- Average Established Patient Price $74.38
- Minimum Established Patient Price $19.15
- Maximum Established Patient Price $147.12
- Average Established Patient Copayment $18.59
- Minimum Established Patient Copayment $4.78
- Maximum Established Patient Copayment $36.78
* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.
CLIA Information
The Clinical Laboratory Improvement Amendments (CLIA) of 1988 applies to facilities or sites that test human specimens for health assessment or to diagnose, prevent, or treat disease. The CLIA Program sets standards for clinical laboratory testing and issues certificates. The NPI / CLIA crosswalk information for this NPI number is:
- CLIA Number
- 14D2245648
- Facility Type
- Practitioner Other
- Certificate Effective Date
- December 15, 2023
- Certificate Expiration Date
- December 14, 2025
- Laboratory Director
- WILLIAM M. BRENNAN JR
- Certificate Type
- Certificate of Waiver
- Certificate Type Description
- This CLIA certificate is issued to William Brennan to perform only waived tests. CLIA defines waived tests as simple tests with a low risk for an incorrect result. Waived tests include certain tests listed in CLIA regulations, tests cleared by the FDA for home use and tests approved by the FDA for waived status and that meet CLIA waiver criteria.
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NPI Validation Check Digit Calculation
The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.
| Start with the original NPI number, the last digit is the check digit and is not used in the calculation. | |||||||||
| 1 | 2 | 3 | 5 | 1 | 4 | 2 | 7 | 4 | 6 |
| Step 1: Double the value of the alternate digits, beginning with the rightmost digit. | |||||||||
| 2 | 2 | 6 | 5 | 2 | 4 | 4 | 7 | 8 | |
| Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24. | |||||||||
| 2 + 2 + 6 + 5 + 2 + 4 + 4 + 7 + 8 + 24 = 64 | |||||||||
| Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit. | |||||||||
| 70 - 64 = 6 | 6 | ||||||||
The NPI number 1235142746 is valid because the calculated check digit 6 using the Luhn validation algorithm matches the last digit of the original NPI number.
Other Providers at the Same Location
The following 6 providers are registered at the same or nearby location.
| NPI | Name / Type | Taxonomy | Address |
|---|---|---|---|
| 1265501175 | DR. WILLIAM MICHAEL BRENNAN JR. D.D.S. Individual | Dentist | 5133 WASHINGTON ST SUITE 4 DOWNERS GROVE, IL 60515 (630) 969-4645 |
| 1093851511 | JOHN G MARCHESE DDS LTD Organization | Dentist (General Practice) | 5133 WASHINGTON ST SUITE # 10 DOWNERS GROVE, IL 60515 (630) 964-7852 |
| 1124233218 | DR. JOHN E KEENAN DDS Individual | Dentist | 5133 WASHINGTON ST SUITE 2 DOWNERS GROVE, IL 60515 (630) 960-1910 |
| 1639313794 | RACHEL HELEN POWERS MA, LCPC, NCC Individual | Counselor (Professional) | 5133 WASHINGTON ST SUITE 8 DOWNERS GROVE, IL 60515 (312) 912-1448 |
| 1588946669 | MRS. SARAH KAY CLINE L.C.S.W. Individual | Social Worker (Clinical) | 5133 WASHINGTON ST DOWNERS GROVE, IL 60515 (630) 205-3211 |
| 1073875357 | DR. JOHN GERARD MARCHESE D.D.S Individual | Dentist | 5133 WASHINGTON ST SUITE 10 DOWNERS GROVE, IL 60515 (630) 964-7852 |
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1235142746, enumerated in the NPI registry as an "individual" on August 14, 2006
The provider is located at 5133 Washington St Downers Grove, Il 60515 and the phone number is (630) 969-4645
The provider's speciality is Dentist with taxonomy code 122300000X
Yes, as of June 20, 2025 the provider is registered in PECOS and is eligible to order health care services or supplies for Medicare patients. If you are a beneficiary the provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME) and a Home Health Agency (HHA).
Medicare beneficiaries should expect a typical cost of $93.02 with an average copayment of $23.25 for new patient appointments. Established patients should expect a typical charge of $74.38 and an average copayment of 18.59. Please review your insurance plan or contact the provider directly to determine your specific costs.
The provider's CLIA number is 14D2245648 for a "practitioner other" facility with a CLIA Certificate of Waiver. This CLIA certificate is issued to perform only waived tests. CLIA defines waived tests as simple tests with a low risk for an incorrect result. Waived tests include certain tests listed in CLIA regulations, tests cleared by the FDA for home use and tests approved by the FDA for waived status and that meet CLIA waiver criteria..
This NPI record was last updated on August 14, 2006. To officially update your NPI information contact the National Plan and Provider Enumeration System (NPPES) at 1-800-465-3203 (NPI Toll-Free) or by email at [email protected].
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