What is Maria Teresa Tam's NPI number?

Maria Teresa Tam's National Provider Identifier (NPI) is 1003843517, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Maria Teresa Tam's specialty?

Maria Teresa Tam is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).

Where is Maria Teresa Tam located?

Maria Teresa Tam's practice location on file with NPPES is 2845 N Sheridan Rd, Chicago, IL 60657-7227.

What is Maria Teresa Tam's phone number?

The practice phone number listed in the NPPES registry for Maria Teresa Tam is (773) 904-8641.

Does Maria Teresa Tam accept Medicare?

Maria Teresa Tam is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Maria Teresa Tam's NPI active?

Yes — Maria Teresa Tam's NPI (1003843517) is active in the NPPES registry as of the last update on 2020-08-24.

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Maria Teresa Tam, MD

NPI 1003843517 · Obstetrics & Gynecology Physician · Chicago, IL

Maria Teresa Tam, MD is a Obstetrics & Gynecology Physician provider in Chicago, IL (NPI 1003843517).

Provider details

NPI number: 1003843517
Entity type: Individual
Primary specialty: Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Female
Sole proprietor: Yes
License: 036093565 (IL)

Practice location

2845 N Sheridan Rd

Ste 902

Chicago, IL 60657-7227

Phone: (773) 904-8641

Fax: (872) 888-1206

Street-level locationGet directions

More IL providers

Mailing address

2845 N Sheridan Rd

Chicago, IL 60657-7227

Specialties & taxonomies

Obstetrics & Gynecology PhysicianPrimary207V00000XLicense 036093565 (IL)
Allopathic & Osteopathic Physicians

Additional practice locations (2)

2800 N Sheridan Rd
Suite 205n
Chicago, IL 60657-6156
Phone: (773) 904-8641
Fax: (872) 888-1206
4250 Dempster St
Skokie, IL 60076-2008
Phone: (733) 496-4532
Fax: (872) 888-1206

Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Profile Score

Detailed profile(85/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure25% of score
20 yrs in NPPES registry
Profile completeness25% of score
100% of core fields populated
Practice footprint15% of score
3 documented practice locations
Medicare service volume (vs. specialty peers)25% of score
157 Medicare services, 2024 (ranked within specialty)
Open Payments transparency10% of score
Has Open Payments disclosures (2024)

Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

What this provider does (Medicare)

Based on Medicare fee-for-service claims, 2024; not all care is captured.

Service (HCPCS)	Medicare services	Typical Medicare-allowed (2024)
Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213	96	$82
Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214	21	$133
New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204	17	$174
Pelvic Exam99459	12	$23
New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205	11	$211

Typical Medicare-allowed amounts for these services range $23–$211 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.

What this provider prescribes (Medicare Part D)

Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.

Drug	Part D claims (2024)	Beneficiaries
Estradiol	16	—
Misoprostol	15	15
Ibuprofen	11	11

Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do not include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$62,646 across 74 records (Open Payments 2024)

Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.

Enumerated: 2006-06-28
Last updated: 2020-08-24
Certified: 2020-08-24

Frequently asked questions

What is Maria Teresa Tam's NPI number?: Maria Teresa Tam's National Provider Identifier (NPI) is 1003843517, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Maria Teresa Tam's specialty?: Maria Teresa Tam is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
Where is Maria Teresa Tam located?: Maria Teresa Tam's practice location on file with NPPES is 2845 N Sheridan Rd, Chicago, IL 60657-7227.
What is Maria Teresa Tam's phone number?: The practice phone number listed in the NPPES registry for Maria Teresa Tam is (773) 904-8641.
Does Maria Teresa Tam accept Medicare?: Maria Teresa Tam is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
Is Maria Teresa Tam's NPI active?: Yes — Maria Teresa Tam's NPI (1003843517) is active in the NPPES registry as of the last update on 2020-08-24.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.

What this provider does (Medicare)

Based on Medicare fee-for-service claims, 2024; not all care is captured.

Service (HCPCS)	Medicare services	Typical Medicare-allowed (2024)
Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213	96	$82
Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214	21	$133
New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204	17	$174
Pelvic Exam99459	12	$23
New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205	11	$211

What this provider prescribes (Medicare Part D)

Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.

Drug	Part D claims (2024)	Beneficiaries
Estradiol	16	—
Misoprostol	15	15
Ibuprofen	11	11

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$62,646 across 74 records (Open Payments 2024)

Provider details

Practice location

Mailing address

Specialties & taxonomies

Additional practice locations (2)

Profile Score

What this provider does (Medicare)

What this provider prescribes (Medicare Part D)

Transparency — industry payments

Registry dates

Frequently asked questions

Specialties & taxonomies

Additional practice locations (2)

Frequently asked questions

Profile Score

What this provider does (Medicare)

What this provider prescribes (Medicare Part D)

Transparency — industry payments