NPI registry status
Active
2026 NPPES data Hematology (Internal Medicine) Physician NPI 1518055573 M.D.
Verify on CMS → Ian Anderson, M.D.
Hematology (Internal Medicine) Physician in Santa Rosa, 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 1,483 in Hematology (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
2K
Medicare Part D claims · 366 beneficiaries · Hematology (Internal Medicine) Physician avg: 684
Industry payments
$604.16
22 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Ian Anderson, M.D. filed 2,030 Medicare Part D claims in 2024 as a Hematology (Internal Medicine) Physician in Santa Rosa, California.
- 2K
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥84th
- 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.
Federal trust snapshot
What official records show about Ian Anderson, 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 1518055573), first enumerated 10/11/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 2,030 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- 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
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$604.16 in reported industry payments (22 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 Ian Anderson, 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 1518055573 · Hematology (Internal Medicine) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1518055573
- ENUM-LEGACY 2006
- TAX-NARROW 1,483
- RX-MID 2,030
- BOOK-THIN 132 in California
- PHOTO-ENUM Larry Ebbert, MD · 2006
Ian Anderson, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
2,030 ≥ 84th percentile 84% 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)
Ian Anderson, M.D. 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 Ian Anderson, M.D.?
Quality data not reportedPrimary specialty
Hematology (Internal Medicine) Physician
Medicare Part D claims
2,030 197% vs specialty avg
Specialty distribution in California
How Hematology (Internal Medicine) Physician compares to other specialties among California 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 Hematology (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 | 1518055573 |
|---|---|
| Specialty | Hematology (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 10/11/2006 |
Hospital and facility affiliations
Facilities where Ian Anderson, M.D. 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.
Providence Medical Foundation
Petaluma, CA
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 Ian Anderson, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$604
Largest payer
PFIZER 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 Ian Anderson, M.D.. To verify Ian Anderson, 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
2,030
Total Claims
$5.7M
Total Drug Cost
366
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,592.1
- Total Day Supply
- 65,941
- Generic Drug Cost
- $617K
- Opioid Claims
- 152 (7.5% rate)
- Antibiotic Claims
- 31
Patient Demographics
- Average Patient Age
- 75.0 years
- Avg HCC Risk Score
- 2.47
- Gender Split
- 70% female / 30% male
- Age Distribution
- <65: 28, 65-74: 141, 75-84: 152, 85+: 45
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Ian Anderson, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Letrozole
Letrozole
167 claims
- Dexamethasone
Dexamethasone
91 claims
- Prochlorperazine M…
Prochlorperazine Maleate
90 claims
- Potassium Chloride
Potassium Chloride
87 claims
- Tamoxifen Citrate
Tamoxifen Citrate
87 claims
- Prednisone
Prednisone
74 claims
- Lorazepam 62
Lorazepam
62 claims
- Ondansetron Hcl 56
Ondansetron Hcl
56 claims
| Drug | Claims |
|---|---|
| Letrozole | 167 |
| Dexamethasone | 91 |
| Prochlorperazine Maleate | 90 |
| Potassium Chloride | 87 |
| Tamoxifen Citrate | 87 |
| Prednisone | 74 |
| Lorazepam | 62 |
| Ondansetron Hcl | 56 |
| Oxycodone Hcl | 54 |
| Eliquis Apixaban | 47 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Hematology (Internal Medicine) Physician in CA →
All providers in California →
Compare specialties →
Hematology (Internal Medicine) Physician Overview
How Ian Anderson, M.D. fits within the Hematology (Internal Medicine) Physician landscape nationally.
1,483
Hematology (Internal Medicine) Physician Providers in US
50
States with Hematology (Internal Medicine) Physician
684
Avg Claims per Provider
Ian Anderson, M.D.'s 2,030 claims are above the specialty average of 684.
Nationwide Hematology (Internal Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Anderson, both outside California 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 Hematology (Internal Medicine) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Anderson.
One of 132 Hematology (Internal Medicine) Physician providers enrolled in California, 5 are shown here.
Dr. Haifaa Abdulhaq
MD
Fresno, CA
Dr. John Adamson
MD
San Diego, CA
Dr. Julio Alvarenga Thiebaud
M.D.
Irvine, CA
Dr. Idoroenyi Amanam
M.D.
Duarte, CA
Dr. Sally Arai
MD
Stanford, CA
Compare Hematology (Internal Medicine) Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Ian Anderson, M.D.'s specialty? ▼
Ian Anderson, M.D. specializes in Hematology (Internal Medicine) Physician and practices in Santa Rosa, California. Credentials: M.D..
How much does Ian Anderson, M.D. prescribe under Medicare Part D? ▼
In 2024, Ian Anderson, M.D. wrote 2,030 Medicare Part D claims totaling $5.7M in drug costs for 366 beneficiaries.
Where is Ian Anderson, M.D. located? ▼
Ian Anderson, M.D. is located at 3555 ROUND BARN CIR, Santa Rosa, CA, 95403. Phone: (707) 528-1050.
What is Ian Anderson, M.D.'s NPI number? ▼
Ian Anderson, M.D.'s National Provider Identifier (NPI) is 1518055573, issued on 10/11/2006.
Does Ian Anderson, M.D. prescribe opioids? ▼
Yes, Ian Anderson, M.D. had 152 opioid claims in 2024 with an opioid prescribing rate of 7.5%.
How many Hematology (Internal Medicine) Physician providers are there in the US? ▼
There are 1,483 Hematology (Internal Medicine) Physician providers across 50 states in the US. The average Hematology (Internal Medicine) Physician provider writes 684 Medicare Part D claims per year.
What drugs does Ian Anderson, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Ian Anderson, M.D.'s most frequently prescribed drugs include Letrozole, Dexamethasone, Prochlorperazine Maleate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ian Anderson, M.D. accept Medicare? ▼
Ian Anderson, M.D. appears in CMS Medicare data with 2,030 Part D claims and 366 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ian Anderson, M.D.'s credentials? ▼
Ian Anderson, M.D.'s NPI is 1518055573 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.
- 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.