2026 NPPES data Specialist NPI 1427234046 M.D.
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ERIC HAMMERBERG, M.D.

Specialist in WHEAT RIDGE, Colorado. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
147
Medicare Part D claims · 30 beneficiaries · Specialist avg: 1K
Industry payments
$30.13
2 payments · CMS Open Payments (Sunshine Act)

What the federal data shows

ERIC HAMMERBERG, M.D. filed 147 Medicare Part D claims in 2023 as a Specialist in WHEAT RIDGE, Colorado.

147
Part D claims, 2023
$30.13
industry payments (Sunshine Act)

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.

ERIC HAMMERBERG, M.D.'s Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

147 35th percentile higher than 35% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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

What does the federal data show about ERIC HAMMERBERG, M.D.?

Quality data not reported

NPI registry status

Active

Issued 01/14/2008

NPI 1427234046

Primary specialty

Specialist

High-volume

69,658 US NPIs in this specialty

Medicare Part D claims

147 90% vs specialty avg

2023 prescription claims

Specialty avg: 1,474

Specialty distribution in Colorado

How Specialist compares to other specialties among Colorado providers

Colorado providers

Specialist share within Colorado

1. Specialist42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Specialist share within Colorado

Specialty board-certification context

Estimated specialty board-certified rate — Specialist (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Specialist ABMS/AOA estimate

Est. board-certified rate (Specialist) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Specialist) — ABMS / AOA estimate

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).

ERIC HAMMERBERG, M.D. appears in the CMS NPPES registry as a Specialist provider holding M.D. credentials at 4485 WADSWORTH BLVD, WHEAT RIDGE, CO, 80033, with a listed phone of (303) 825-3759. NPI 1427234046 was issued on 01/14/2008. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what HAMMERBERG most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 147 prescription claims written by this provider, covering 30 Medicare beneficiaries and totaling roughly $32K in drug spend. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Specialist is a high-volume specialty nationwide, with 69,658 enrolled providers across 55 states and an average of 1,474 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

4485 WADSWORTH BLVD
WHEAT RIDGE, CO 80033

Provider Details

NPI 1427234046
Specialty Specialist
Credentials M.D.
Gender Male
NPI Issued 01/14/2008

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 ERIC HAMMERBERG, M.D.. Source: openpaymentsdata.cms.gov.

Total received

$30

Largest payer

ABBVIE 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.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

147
Total Claims
$32K
Total Drug Cost
30
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
299
Total Day Supply
8,763
Generic Drug Cost
$10K

Patient Demographics

Average Patient Age
71.4 years
Avg HCC Risk Score
1.35
Gender Split
47% female / 53% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What ERIC HAMMERBERG, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Primidone
20
Donepezil Hcl
19
Gabapentin
16
Levetiracetam
11

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Specialist Overview

How ERIC HAMMERBERG, M.D. fits within the Specialist landscape nationally.

69,658
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider

ERIC HAMMERBERG, M.D.'s 147 claims are below the specialty average of 1,474.

Nearby Specialist Providers in Colorado

Other clinicians with the same primary specialty enrolled in Colorado, drawn from the same CMS NPPES roster as HAMMERBERG.

Compare Specialist nationally: see state-by-state distribution →

Frequently Asked Questions

What is ERIC HAMMERBERG, M.D.'s specialty?
ERIC HAMMERBERG, M.D. specializes in Specialist and practices in WHEAT RIDGE, Colorado. Credentials: M.D..
How much does ERIC HAMMERBERG, M.D. prescribe under Medicare Part D?
In 2023, ERIC HAMMERBERG, M.D. wrote 147 Medicare Part D claims totaling $32K in drug costs for 30 beneficiaries.
Where is ERIC HAMMERBERG, M.D. located?
ERIC HAMMERBERG, M.D. is located at 4485 WADSWORTH BLVD, WHEAT RIDGE, CO, 80033. Phone: (303) 825-3759.
What is ERIC HAMMERBERG, M.D.'s NPI number?
ERIC HAMMERBERG, M.D.'s National Provider Identifier (NPI) is 1427234046, issued on 01/14/2008.
How many Specialist providers are there in the US?
There are 69,658 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does ERIC HAMMERBERG, M.D. prescribe most often?
Based on 2023 Medicare Part D data, ERIC HAMMERBERG, M.D.'s most frequently prescribed drugs include Primidone, Donepezil Hcl, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does ERIC HAMMERBERG, M.D. accept Medicare?
ERIC HAMMERBERG, M.D. appears in CMS Medicare data with 147 Part D claims and 30 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify ERIC HAMMERBERG, M.D.'s credentials?
ERIC HAMMERBERG, M.D.'s NPI is 1427234046 with credentials M.D.. 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

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