NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1336131101 MD
Verify on CMS → Edward Lake, MD
Nephrology Physician in Oshkosh, Wisconsin.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,534 in Nephrology 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
2K
Medicare Part D claims · 298 beneficiaries · Nephrology Physician avg: 1K
Generic prescribing
92%
generic claims · 8% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$34.67
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Edward Lake, MD filed 1,997 Medicare Part D claims in 2023 as a Nephrology Physician in Oshkosh, Wisconsin, prescribing 92% generic.
- 2K
- Part D claims, 2023
- 92%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Edward Lake, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,997 Top 16% higher than 84% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Edward Lake, 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 Edward Lake, MD?
Quality data not reportedPrimary specialty
Nephrology Physician
Medicare Part D claims
1,997 37% vs specialty avg
Specialty distribution in Wisconsin
How Nephrology Physician compares to other specialties among Wisconsin 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 Nephrology 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).
Edward Lake, MD appears in the CMS NPPES registry as a Nephrology Physician provider holding MD credentials at 855 N WESTHAVEN DR, Oshkosh, WI, 54904, with a listed phone of (920) 303-5626. NPI 1336131101 was issued on 08/18/2005.
Medicare Part D records for calendar year 2023 show 1,997 prescription claims written by this provider, covering 298 Medicare beneficiaries and totaling roughly $200K in drug spend, split 8% brand-name and 92% generic by claim count.
Nephrology Physician is a mid-sized specialty nationwide, with 10,534 enrolled providers across 55 states and an average of 1,454 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1336131101 |
|---|---|
| Specialty | Nephrology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 08/18/2005 |
Hospital and facility affiliations
Facilities where Edward Lake, 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.
Aurora Medical Group, Inc.
Milwaukee, WI
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 Edward Lake, MD. Source: openpaymentsdata.cms.gov.
Total received
$35
Largest payer
Ardelyx, 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.
Brand vs generic prescribing mix · Generic-heavy
Edward Lake, MD - brand share 8.0%
Nephrology Physician average
8% brand-name claims vs 92% generic, on 1,997 2023 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 2023.
1,997
Total Claims
$200K
Total Drug Cost
298
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,415
- Total Day Supply
- 129,052
- Brand vs Generic
- 8% brand / 92% generic
- Brand Drug Cost
- $109K
- Generic Drug Cost
- $91K
- Antibiotic Claims
- 74
Patient Demographics
- Average Patient Age
- 72.9 years
- Avg HCC Risk Score
- 3.65
- Gender Split
- 56% female / 44% male
- Age Distribution
- <65: 43, 65-74: 122, 75-84: 93, 85+: 40
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Edward Lake, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Calcitriol
Calcitriol
300 claims
- Furosemide
Furosemide
232 claims
- Allopurinol
Allopurinol
198 claims
- Acetazolamide
Acetazolamide
126 claims
- Losartan Potassium 54
Losartan Potassium
54 claims
- Potassium Chloride 47
Potassium Chloride
47 claims
- Cinacalcet Hcl 42
Cinacalcet Hcl
42 claims
- Atorvastatin Calcium 41
Atorvastatin Calcium
41 claims
| Drug | Claims |
|---|---|
| Calcitriol | 300 |
| Furosemide | 232 |
| Allopurinol | 198 |
| Acetazolamide | 126 |
| Losartan Potassium | 54 |
| Potassium Chloride | 47 |
| Cinacalcet Hcl | 42 |
| Atorvastatin Calcium | 41 |
| Lisinopril | 41 |
| Prednisone | 41 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nephrology Physician Overview
How Edward Lake, MD fits within the Nephrology Physician landscape nationally.
10,534
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,454
Avg Claims per Provider
Edward Lake, MD's 1,997 claims are above the specialty average of 1,454.
Nearby Nephrology Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Lake.
Dr. Uzoamaka Achufusi
MBBS
Fitchburg, WI
Dr. Venkata Adavikolanu
MD
Green Bay, WI
Dr. Omer Afzal
M.D.
Waukesha, WI
Dr. Osaid Ahmad
MD
Neenah, WI
Dr. Edward Ahrens
M.D.
Madison, WI
Compare Nephrology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Wisconsin medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Nephrology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Medical Specialties Explained
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How insurance networks affect your costs
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Frequently Asked Questions
What is Edward Lake, MD's specialty? ▼
Edward Lake, MD specializes in Nephrology Physician and practices in Oshkosh, Wisconsin. Credentials: MD.
How much does Edward Lake, MD prescribe under Medicare Part D? ▼
In 2023, Edward Lake, MD wrote 1,997 Medicare Part D claims totaling $200K in drug costs for 298 beneficiaries.
Where is Edward Lake, MD located? ▼
Edward Lake, MD is located at 855 N WESTHAVEN DR, Oshkosh, WI, 54904. Phone: (920) 303-5626.
What is Edward Lake, MD's NPI number? ▼
Edward Lake, MD's National Provider Identifier (NPI) is 1336131101, issued on 08/18/2005.
Does Edward Lake, MD prescribe more brand-name or generic drugs? ▼
Edward Lake, MD's prescribing is 8% brand-name and 92% generic drugs by claim count, with $109K in brand drug costs.
How many Nephrology Physician providers are there in the US? ▼
There are 10,534 Nephrology Physician providers across 55 states in the US. The average Nephrology Physician provider writes 1,454 Medicare Part D claims per year.
What drugs does Edward Lake, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Edward Lake, MD's most frequently prescribed drugs include Calcitriol, Furosemide, Allopurinol. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Edward Lake, MD accept Medicare? ▼
Edward Lake, MD appears in CMS Medicare data with 1,997 Part D claims and 298 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Edward Lake, MD's credentials? ▼
Edward Lake, MD's NPI is 1336131101 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 (2023). 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 April 2026 (NPPES) / 2023 (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
Compiled from official public sources by the PlainDoctor editorial team.