NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1942498464 MD
Verify on CMS → Gustavo Alza, MD
Internal Medicine Physician in Los Angeles, California.
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
5K
Medicare Part D claims · 167 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
85%
generic claims · 14% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
97.7/100
▲ 14 pts above national avg 83.5 · Exceptional
Industry payments
$998.62
14 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Gustavo Alza, MD reported a CMS MIPS final score of 97.7/100 - above the 83.5 national average - and filed 5,429 Medicare Part D claims in 2023.
- 97.7/100
- MIPS score · +14 vs avg
- 5K
- Part D claims, 2023
- 85%
- 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.
CMS NPPES provider registry desk
NPI 1942498464 · Internal Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · MIPS-ELITE · RX-MID · BOOK-MID · PHOTO-FINISH
- NPI-10 1942498464
- ENUM-MID 2007
- TAX-MEGA 173K Internal Medicine
- MIPS-ELITE 97.7/100
- RX-MID 5,429
- BOOK-MID 20,046 in California
- PHOTO-FINISH Olusegun Oseni · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Alza · this prov…
Alza · this provider
97.7 MIPS pts
- Orhan Sancaktar …
Orhan Sancaktar
97.7 MIPS pts
- Olusegun Oseni ·…
Olusegun Oseni
97.7 MIPS pts
- Svien Senne · hi…
Svien Senne
97.8 MIPS pts
- Gregory Erickson…
Gregory Erickson
97.8 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Gustavo Alza, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
98 ≥ 84th percentile 84% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Gustavo Alza, MD sits
This provider among internal medicine physician peers
Across the 34,612 internal medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Gustavo Alza, MD writes more Part D claims than 83% of them and scores higher on MIPS quality than 88% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one internal medicine physician peer from a representative sample of 60; the gold marker is Gustavo Alza, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Gustavo Alza, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Gustavo Alza, MD?
High performer (top quartile)Primary specialty
Internal Medicine Physician
Medicare Part D claims
5,429 100% vs specialty avg
MIPS final score
97.7/100 14.2 pts vs avg
Specialty distribution in California
How Internal Medicine Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Gustavo Alza, MD's 2023 MIPS final score plotted against the Internal Medicine Physician national average
- MIPS Final Score
- 97.7/100
- vs 83.5 national avg · 2023 performance year
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 | 1942498464 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 10/10/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
97.7461
Final Score
Measured-score avg: 83.5
96.3723
Quality
69.3063
Cost
Reporting: Individual
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 Gustavo Alza, MD. Source: openpaymentsdata.cms.gov.
Total received
$999
Largest payer
Janssen Pharmaceuticals, 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 - California MBC 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 ~150K California medical licensees in 2023 - they are NOT specific to Gustavo Alza, MD. To verify Gustavo Alza, MD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC 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 California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Gustavo Alza, MD - brand share 14.0%
Internal Medicine Physician average
14% brand-name claims vs 85% generic, on 5,429 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.
5,429
Total Claims
$630K
Total Drug Cost
167
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 8,634
- Total Day Supply
- 252,712
- Brand vs Generic
- 14% brand / 85% generic
- Brand Drug Cost
- $506K
- Generic Drug Cost
- $122K
- Opioid Claims
- 189 (3.5% rate)
- Antibiotic Claims
- 94
Patient Demographics
- Average Patient Age
- 79.6 years
- Avg HCC Risk Score
- 1.83
- Gender Split
- 57% female / 43% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gustavo Alza, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Quetiapine Fumarate
Quetiapine Fumarate
260 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
245 claims
- Trazodone Hcl
Trazodone Hcl
220 claims
- Pioglitazone Hcl
Pioglitazone Hcl
199 claims
- Gabapentin
Gabapentin
186 claims
- Levothyroxine Sodium
Levothyroxine Sodium
174 claims
- Metformin Hcl
Metformin Hcl
160 claims
- Diclofenac Sodium
Diclofenac Sodium
158 claims
| Drug | Claims |
|---|---|
| Quetiapine Fumarate | 260 |
| Rosuvastatin Calcium | 245 |
| Trazodone Hcl | 220 |
| Pioglitazone Hcl | 199 |
| Gabapentin | 186 |
| Levothyroxine Sodium | 174 |
| Metformin Hcl | 160 |
| Diclofenac Sodium | 158 |
| Losartan Potassium | 136 |
| Ezetimibe | 124 |
* 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 Gustavo Alza, MD 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
Gustavo Alza, MD's 5,429 claims are above the specialty average of 2,716.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Alza, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (97.7 here).
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Internal Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Alza.
One of 20,046 Internal Medicine Physician providers enrolled in California, 5 are shown here.
Dr. Jacob Aaron
MD
San Francisco, CA
Dr. Alistair Aaronson
MD
Stanford, CA
Dr. Jose Abad.
MD
Sacramento, CA
Dr. Donna Abare
MD
Oakland, CA
Marce Abare
Scotts Valley, CA
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Gustavo Alza, MD's specialty? ▼
Gustavo Alza, MD specializes in Internal Medicine Physician and practices in Los Angeles, California. Credentials: MD.
How much does Gustavo Alza, MD prescribe under Medicare Part D? ▼
In 2023, Gustavo Alza, MD wrote 5,429 Medicare Part D claims totaling $630K in drug costs for 167 beneficiaries.
What is Gustavo Alza, MD's Medicare quality score? ▼
Gustavo Alza, MD has a CMS MIPS Final Score of 97.7/100 (Quality: 96.4, Cost: 69.3). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Gustavo Alza, MD located? ▼
Gustavo Alza, MD is located at 5224 N FIGUEROA STREET, Los Angeles, CA, 90042. Phone: (323) 259-0456.
What is Gustavo Alza, MD's NPI number? ▼
Gustavo Alza, MD's National Provider Identifier (NPI) is 1942498464, issued on 10/10/2007.
Does Gustavo Alza, MD prescribe more brand-name or generic drugs? ▼
Gustavo Alza, MD's prescribing is 14% brand-name and 85% generic drugs by claim count, with $506K in brand drug costs.
Does Gustavo Alza, MD prescribe opioids? ▼
Yes, Gustavo Alza, MD had 189 opioid claims in 2023 with an opioid prescribing rate of 3.5%.
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 Gustavo Alza, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Gustavo Alza, MD's most frequently prescribed drugs include Quetiapine Fumarate, Rosuvastatin Calcium, Trazodone Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gustavo Alza, MD accept Medicare? ▼
Gustavo Alza, MD appears in CMS Medicare data with 5,429 Part D claims and 167 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gustavo Alza, MD's credentials? ▼
Gustavo Alza, MD's NPI is 1942498464 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.