NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1528159233 M.D.
Verify on CMS → Ajit Shah, M.D.
Internal Medicine Physician in La Mirada, 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 174,792 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
11K
Medicare Part D claims · 653 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
89%
generic claims · 10% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
75/100
CMS neutral threshold · no category scores published
Industry payments
$335.5
11 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Ajit Shah, M.D. carries the neutral CMS MIPS final score of 75/100, assigned where no category was scored - and filed 11,290 Medicare Part D claims in 2024.
- 75/100
- CMS neutral score · not measured
- 11K
- Part D claims, 2024
- 89%
- 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.
Federal trust snapshot
What official records show about Ajit Shah, M.D.
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 1528159233), first enumerated 09/27/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 11,290 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
CMS assigned a neutral MIPS final score of 75/100 where no performance category was scored — not a measured quality rank.
Source: CMS Quality Payment Program
- 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
Industry payment transparency
$335.5 in reported industry payments (11 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
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Ajit Shah, M.D.'s individual license status. Verify directly with the state medical board.
Source: MBC 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 1528159233 · Internal Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · MIPS-NEUTRAL · RX-HEAVY · BOOK-MID · PHOTO-ENUM
- NPI-10 1528159233
- ENUM-LEGACY 2006
- TAX-MEGA 175K Internal Medicine
- MIPS-NEUTRAL 75/100
- RX-HEAVY 11K claims
- BOOK-MID 20,403 in California
- PHOTO-ENUM Jyoti Chawla · 2006
Ajit Shah, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
11,290 ≥ 98th percentile 98% 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)
Ajit Shah, M.D. 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 Ajit Shah, M.D.?
CMS neutral score, not measuredPrimary specialty
Internal Medicine Physician
Medicare Part D claims
11,290 305% vs specialty avg
MIPS final score
75/100
Specialty distribution in California
How Internal Medicine Physician compares to other specialties among California providers
MIPS score not measured
CMS assigned a neutral 75/100 threshold
CMS did not publish any Quality, Cost, Promoting Interoperability, or Improvement Activities category score for this clinician. This administrative threshold is not comparable with the national average of clinicians whose MIPS score was measured.
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 | 1528159233 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 09/27/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
CMS neutral threshold · not measured
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 Ajit Shah, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$336
Largest payer
AstraZeneca Pharmaceuticals LP
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 Ajit Shah, M.D.. To verify Ajit Shah, M.D.'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
Ajit Shah, M.D. - brand share 10.0%
Internal Medicine Physician average
10% brand-name claims vs 89% generic, on 11,290 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.
11,290
Total Claims
$759K
Total Drug Cost
653
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 22,940.366
- Total Day Supply
- 653,571
- Brand vs Generic
- 10% brand / 89% generic
- Brand Drug Cost
- $583K
- Generic Drug Cost
- $170K
- Opioid Claims
- 175 (1.6% rate)
- Antibiotic Claims
- 734
Patient Demographics
- Average Patient Age
- 74.8 years
- Avg HCC Risk Score
- 1.31
- Gender Split
- 55% female / 45% male
- Age Distribution
- <65: 65, 65-74: 250, 75-84: 240, 85+: 98
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Ajit Shah, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atorvastatin Calcium
Atorvastatin Calcium
503 claims
- Levothyroxine Sodium
Levothyroxine Sodium
468 claims
- Amlodipine Besylate
Amlodipine Besylate
445 claims
- Losartan Potassium
Losartan Potassium
393 claims
- Metformin Hcl
Metformin Hcl
318 claims
- Simvastatin
Simvastatin
279 claims
- Omeprazole
Omeprazole
248 claims
- Pantoprazole Sodium
Pantoprazole Sodium
229 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 503 |
| Levothyroxine Sodium | 468 |
| Amlodipine Besylate | 445 |
| Losartan Potassium | 393 |
| Metformin Hcl | 318 |
| Simvastatin | 279 |
| Omeprazole | 248 |
| Pantoprazole Sodium | 229 |
| Azithromycin | 228 |
| Lisinopril | 223 |
* 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 Ajit Shah, M.D. fits within the Internal Medicine Physician landscape nationally.
174,792
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,785
Avg Claims per Provider
Ajit Shah, M.D.'s 11,290 claims are above the specialty average of 2,785.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Shah, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (75 here).
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 California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Shah.
One of 20,403 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 Ajit Shah, M.D.'s specialty? ▼
Ajit Shah, M.D. specializes in Internal Medicine Physician and practices in La Mirada, California. Credentials: M.D..
How much does Ajit Shah, M.D. prescribe under Medicare Part D? ▼
In 2024, Ajit Shah, M.D. wrote 11,290 Medicare Part D claims totaling $759K in drug costs for 653 beneficiaries.
What is Ajit Shah, M.D.'s Medicare quality score? ▼
Ajit Shah, M.D. has a CMS MIPS Final Score of 75/100. CMS published no Quality, Promoting Interoperability, Improvement Activity or Cost score for this clinician, so the final score is the neutral performance threshold CMS assigns rather than a measured result. 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 Ajit Shah, M.D. located? ▼
Ajit Shah, M.D. is located at 15651 IMPERIAL HWY STE 104, La Mirada, CA, 90638. Phone: (562) 947-1619.
What is Ajit Shah, M.D.'s NPI number? ▼
Ajit Shah, M.D.'s National Provider Identifier (NPI) is 1528159233, issued on 09/27/2006.
Does Ajit Shah, M.D. prescribe more brand-name or generic drugs? ▼
Ajit Shah, M.D.'s prescribing is 10% brand-name and 89% generic drugs by claim count, with $583K in brand drug costs.
Does Ajit Shah, M.D. prescribe opioids? ▼
Yes, Ajit Shah, M.D. had 175 opioid claims in 2024 with an opioid prescribing rate of 1.6%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 174,792 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,785 Medicare Part D claims per year.
What drugs does Ajit Shah, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Ajit Shah, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ajit Shah, M.D. accept Medicare? ▼
Ajit Shah, M.D. appears in CMS Medicare data with 11,290 Part D claims and 653 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ajit Shah, M.D.'s credentials? ▼
Ajit Shah, M.D.'s NPI is 1528159233 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 (2024). 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 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.