Mary Faith Terkildsen, MD
NPI 1407870199 · Obstetrics & Gynecology Physician · Lake Forest, IL
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Faith Terkildsen, MD is a Obstetrics & Gynecology Physician provider in Lake Forest, IL (NPI 1407870199).
Provider details
- NPI number
- 1407870199
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 036103018 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
246 Medicare services, 2024 (ranked within specialty)
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) |
|---|---|---|
| Cervical Or Vaginal Cancer Screening; Pelvic and Clinical Breast ExaminationG0101 | 90 | $29 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 63 | $71 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 60 | $102 |
| Screening Papanicolaou Smear; Obtaining, Preparing and Conveyance of Cervical Or Vaginal Smear to LaboratoryQ0091 | 18 | $19 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 15 | $150 |
Typical Medicare-allowed amounts for these services range $19–$150 (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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Estradiol | 252 | 121 |
| Triamcinolone Acetonide | 28 | 18 |
| Estradiolbrand: Estradiol (twice Weekly) | 26 | — |
| Clobetasol Propionate | 23 | 12 |
| Valacyclovir Hclbrand: Valacyclovir | 20 | — |
| Norethindrone Acetate | 19 | — |
| Progesterone, Micronizedbrand: Progesterone | 19 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-26
- Last updated
- 2026-05-07
- Certified
- 2026-05-07
Frequently asked questions
- What is Mary Faith Terkildsen's NPI number?
- Mary Faith Terkildsen's National Provider Identifier (NPI) is 1407870199, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Faith Terkildsen's specialty?
- Mary Faith Terkildsen is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Faith Terkildsen located?
- Mary Faith Terkildsen's practice location on file with NPPES is 959 S Waukegan Rd Fl 2, Lake Forest, IL 60045-2654.
- What is Mary Faith Terkildsen's phone number?
- The practice phone number listed in the NPPES registry for Mary Faith Terkildsen is (847) 234-3250.
- Does Mary Faith Terkildsen accept Medicare?
- Mary Faith Terkildsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Faith Terkildsen's NPI active?
- Yes — Mary Faith Terkildsen's NPI (1407870199) is active in the NPPES registry as of the last update on 2026-05-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.