NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1427066570 M.D.
Verify on CMS → Alberto Guerrero, M.D.
Internal Medicine Physician in Scottsdale, Arizona.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,737 in Internal Medicine 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
1K
Medicare Part D claims · 283 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
88%
generic claims · 10% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Alberto Guerrero, M.D. filed 1,363 Medicare Part D claims in 2023 as an Internal Medicine Physician in Scottsdale, Arizona, prescribing 88% generic.
- 1K
- Part D claims, 2023
- 88%
- generic prescribing
- ≥79th
- 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.
CMS NPPES provider registry desk
NPI 1427066570 · Internal Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1427066570
- ENUM-LEGACY 2006
- TAX-MEGA 173K Internal Medicine
- RX-MID 1,363
- BOOK-LIGHT 3,374 in Arizona
- PHOTO-ENUM Michael Padial · 2006
Alberto Guerrero, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,363 ≥ 79th percentile 79% of 1,370,886 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 · 2023
◑
Board-eligible specialty (heuristic, not verified)
Alberto Guerrero, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Alberto Guerrero, M.D.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
1,363 50% vs specialty avg
Specialty distribution in Arizona
How Internal Medicine Physician compares to other specialties among Arizona 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 Internal Medicine 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 | 1427066570 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 08/04/2006 |
Brand vs generic prescribing mix · Typical
Alberto Guerrero, M.D. - brand share 10.0%
Internal Medicine Physician average
10% brand-name claims vs 88% generic, on 1,363 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.
1,363
Total Claims
$111K
Total Drug Cost
283
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,997
- Total Day Supply
- 82,775
- Brand vs Generic
- 10% brand / 88% generic
- Brand Drug Cost
- $82K
- Generic Drug Cost
- $29K
- Opioid Claims
- 45 (3.3% rate)
- Antibiotic Claims
- 127
Patient Demographics
- Average Patient Age
- 74.2 years
- Avg HCC Risk Score
- 0.85
- 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 Alberto Guerrero, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Azithromycin
Azithromycin
65 claims
- Amlodipine Besylate
Amlodipine Besylate
64 claims
- Atorvastatin Calcium
Atorvastatin Calcium
62 claims
- Lisinopril
Lisinopril
55 claims
- Metformin Hcl
Metformin Hcl
50 claims
- Levothyroxine Sodium
Levothyroxine Sodium
45 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
45 claims
- Allopurinol
Allopurinol
39 claims
| Drug | Claims |
|---|---|
| Azithromycin | 65 |
| Amlodipine Besylate | 64 |
| Atorvastatin Calcium | 62 |
| Lisinopril | 55 |
| Metformin Hcl | 50 |
| Levothyroxine Sodium | 45 |
| Rosuvastatin Calcium | 45 |
| Allopurinol | 39 |
| Ipratropium Bromide | 37 |
| Pantoprazole Sodium | 37 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Alberto Guerrero, M.D. fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Alberto Guerrero, M.D.'s 1,363 claims are below the specialty average of 2,716.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Guerrero, both outside Arizona so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Internal Medicine Physician Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Guerrero.
One of 3,374 Internal Medicine Physician providers enrolled in Arizona, 5 are shown here.
Dr. Daniel Aaronson
MD
Tucson, AZ
Dr. Jaber Abawi
MD
Payson, AZ
Dr. Demsas Abay
MD
Peoria, AZ
Dr. Firas Abbas
M.D. M.P.H.
Mesa, AZ
Dr. Hassan Abbas
D.O.
Mesa, AZ
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Alberto Guerrero, M.D.'s specialty? ▼
Alberto Guerrero, M.D. specializes in Internal Medicine Physician and practices in Scottsdale, Arizona. Credentials: M.D..
How much does Alberto Guerrero, M.D. prescribe under Medicare Part D? ▼
In 2023, Alberto Guerrero, M.D. wrote 1,363 Medicare Part D claims totaling $111K in drug costs for 283 beneficiaries.
Where is Alberto Guerrero, M.D. located? ▼
Alberto Guerrero, M.D. is located at 7400 E THOMPSON PEAK PKWY, Scottsdale, AZ, 85255. Phone: (480) 630-6688.
What is Alberto Guerrero, M.D.'s NPI number? ▼
Alberto Guerrero, M.D.'s National Provider Identifier (NPI) is 1427066570, issued on 08/04/2006.
Does Alberto Guerrero, M.D. prescribe more brand-name or generic drugs? ▼
Alberto Guerrero, M.D.'s prescribing is 10% brand-name and 88% generic drugs by claim count, with $82K in brand drug costs.
Does Alberto Guerrero, M.D. prescribe opioids? ▼
Yes, Alberto Guerrero, M.D. had 45 opioid claims in 2023 with an opioid prescribing rate of 3.3%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Alberto Guerrero, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Alberto Guerrero, M.D.'s most frequently prescribed drugs include Azithromycin, Amlodipine Besylate, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Alberto Guerrero, M.D. accept Medicare? ▼
Alberto Guerrero, M.D. appears in CMS Medicare data with 1,363 Part D claims and 283 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Alberto Guerrero, M.D.'s credentials? ▼
Alberto Guerrero, M.D.'s NPI is 1427066570 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
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
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 May 2026.