NPI registry status
Active
2026 NPPES data Obstetrics Physician NPI 1538155650 MD
Verify on CMS → Vicki Chamberlain, MD
Obstetrics Physician in Arlington Hts, Illinois.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,420 in Obstetrics Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
173
Medicare Part D claims · 63 beneficiaries · Obstetrics Physician avg: 331
Generic prescribing
87%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$649.51
31 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Vicki Chamberlain, MD filed 173 Medicare Part D claims in 2024 as an Obstetrics Physician in Arlington Hts, Illinois, prescribing 87% generic.
- 173
- Part D claims, 2024
- 87%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥34th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Vicki Chamberlain, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1538155650), first enumerated 09/23/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 173 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$649.51 in reported industry payments (31 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
Illinois statewide board action statistics are published annually — these figures describe aggregate state activity, not Vicki Chamberlain, MD's individual license status. Verify directly with the state medical board.
Source: IDFPR annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1538155650 · Obstetrics Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1538155650
- ENUM-LEGACY 2005
- TAX-NARROW 1,420
- RX-LIGHT 173
- BOOK-THIN 58 in Illinois
- PHOTO-ENUM Thomas Goldenberg, MD · 2005
Vicki Chamberlain, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
173 ≥ 34th percentile 34% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Vicki Chamberlain, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Vicki Chamberlain, MD?
Quality data not reportedPrimary specialty
Obstetrics Physician
Medicare Part D claims
173 48% vs specialty avg
Specialty distribution in Illinois
How Obstetrics Physician compares to other specialties among Illinois providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Obstetrics Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1538155650 |
|---|---|
| Specialty | Obstetrics Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 09/23/2005 |
Hospital and facility affiliations
Facilities where Vicki Chamberlain, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Northwest Community Women Services LLC
Arlington Heights, IL
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Vicki Chamberlain, MD. Source: openpaymentsdata.cms.gov.
Total received
$650
Largest payer
Amgen Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - Illinois IDFPR 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~42K Illinois medical licensees in 2023 - they are NOT specific to Vicki Chamberlain, MD. To verify Vicki Chamberlain, MD's current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases
IDFPR publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Illinois disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Vicki Chamberlain, MD - brand share 13.0%
Obstetrics Physician average
13% brand-name claims vs 87% generic, on 173 2024 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
173
Total Claims
$11K
Total Drug Cost
63
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 424.433
- Total Day Supply
- 11,891
- Brand vs Generic
- 13% brand / 87% generic
- Brand Drug Cost
- $4K
- Generic Drug Cost
- $6K
- Antibiotic Claims
- 19
Patient Demographics
- Average Patient Age
- 71.1 years
- Avg HCC Risk Score
- 0.64
- Gender Split
- 100% female / 0% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Vicki Chamberlain, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Estradiol
Estradiol
33 claims
- Raloxifene Hcl
Raloxifene Hcl
24 claims
- Medroxyprogesteron… 13
Medroxyprogesterone Acetate
13 claims
- Levothyroxine Sodium 11
Levothyroxine Sodium
11 claims
| Drug | Claims |
|---|---|
| Estradiol | 33 |
| Raloxifene Hcl | 24 |
| Medroxyprogesterone Acetate | 13 |
| Levothyroxine Sodium | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Obstetrics Physician Overview
How Vicki Chamberlain, MD fits within the Obstetrics Physician landscape nationally.
1,420
Obstetrics Physician Providers in US
54
States with Obstetrics Physician
331
Avg Claims per Provider
Vicki Chamberlain, MD's 173 claims are below the specialty average of 331.
Nationwide Obstetrics Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Chamberlain, both outside Illinois so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Obstetrics Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Chamberlain.
One of 58 Obstetrics Physician providers enrolled in Illinois, 5 are shown here.
Dr. Raanan Alter
MD
Warrenville, IL
Anthony Amiewalan
MD FACOG
Decatur, IL
Dr. Medha Amin
MD
Downers Grove, IL
Dr. Heather Bouma-Johnston
MD
Chicago, IL
Dr. Jesse Buedefeldt-Pollard
M.D.
Springfield, IL
Compare Obstetrics Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Vicki Chamberlain, MD's specialty? ▼
Vicki Chamberlain, MD specializes in Obstetrics Physician and practices in Arlington Hts, Illinois. Credentials: MD.
How much does Vicki Chamberlain, MD prescribe under Medicare Part D? ▼
In 2024, Vicki Chamberlain, MD wrote 173 Medicare Part D claims totaling $11K in drug costs for 63 beneficiaries.
Where is Vicki Chamberlain, MD located? ▼
Vicki Chamberlain, MD is located at 675 W CENTRAL RD, Arlington Hts, IL, 60005. Phone: (847) 392-9191.
What is Vicki Chamberlain, MD's NPI number? ▼
Vicki Chamberlain, MD's National Provider Identifier (NPI) is 1538155650, issued on 09/23/2005.
Does Vicki Chamberlain, MD prescribe more brand-name or generic drugs? ▼
Vicki Chamberlain, MD's prescribing is 13% brand-name and 87% generic drugs by claim count, with $4K in brand drug costs.
How many Obstetrics Physician providers are there in the US? ▼
There are 1,420 Obstetrics Physician providers across 54 states in the US. The average Obstetrics Physician provider writes 331 Medicare Part D claims per year.
What drugs does Vicki Chamberlain, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Vicki Chamberlain, MD's most frequently prescribed drugs include Estradiol, Raloxifene Hcl, Medroxyprogesterone Acetate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Vicki Chamberlain, MD accept Medicare? ▼
Vicki Chamberlain, MD appears in CMS Medicare data with 173 Part D claims and 63 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Vicki Chamberlain, MD's credentials? ▼
Vicki Chamberlain, MD's NPI is 1538155650 with credentials MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.