NPI registry status
Active
2026 NPPES data Allergy & Immunology (Internal Medicine) Physician NPI 1235251216 M.D.
Verify on CMS → Steven Song, M.D.
Allergy & Immunology (Internal Medicine) Physician in Richmond, 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 517 in Allergy & Immunology (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
240
Medicare Part D claims · 71 beneficiaries · Allergy & Immunology (Internal Medicine) Physician avg: 798
Generic prescribing
73%
generic claims · 28% 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
Steven Song, M.D. filed 240 Medicare Part D claims in 2023 as an Allergy & Immunology (Internal Medicine) Physician in Richmond, California, prescribing 73% generic.
- 240
- Part D claims, 2023
- 73%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥49th
- 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.
Steven Song, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
240 ≥ 49th percentile 49% 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 certification likely (heuristic, not verified)
Steven Song, 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 Steven Song, M.D.?
Quality data not reportedPrimary specialty
Allergy & Immunology (Internal Medicine) Physician
Medicare Part D claims
240 70% vs specialty avg
Specialty distribution in California
How Allergy & Immunology (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 Allergy & Immunology (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).
Steven Song, M.D. appears in the CMS NPPES registry as an Allergy & Immunology (Internal Medicine) Physician provider holding M.D. credentials at 901 NEVIN AVE, Richmond, CA, 94801, with a listed phone of (510) 307-1525. NPI 1235251216 was issued on 04/03/2007.
Medicare Part D records for calendar year 2023 show 240 prescription claims written by this provider, covering 71 Medicare beneficiaries and totaling roughly $62K in drug spend, split 28% brand-name and 73% generic by claim count.
Allergy & Immunology (Internal Medicine) Physician is a narrow specialty nationwide, with 517 enrolled providers across 47 states and an average of 798 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
Provider Details
| NPI | 1235251216 |
|---|---|
| Specialty | Allergy & Immunology (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 04/03/2007 |
Hospital and facility affiliations
Facilities where Steven Song, 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.
Permanente Medical Group Inc
Richmond, 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).
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 Steven Song, M.D.. To verify Steven Song, 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 · Above average
Steven Song, M.D. - brand share 28.0%
Allergy & Immunology (Internal Medicine) Physician average
28% brand-name claims vs 73% generic, on 240 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.
240
Total Claims
$62K
Total Drug Cost
71
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 425
- Total Day Supply
- 12,294
- Brand vs Generic
- 28% brand / 73% generic
- Brand Drug Cost
- $53K
- Generic Drug Cost
- $9K
Patient Demographics
- Average Patient Age
- 72.4 years
- Avg HCC Risk Score
- 0.95
- Gender Split
- 59% female / 41% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Steven Song, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Azelastine Hcl
Azelastine Hcl
76 claims
- Albuterol Sulfate …
Albuterol Sulfate Hfa
32 claims
- Montelukast Sodium 21
Montelukast Sodium
21 claims
- Fluticasone Propio… 19
Fluticasone Propionate
19 claims
- Wixela Inhub 16
Wixela Inhub
16 claims
- Alvesco 15
Alvesco
15 claims
- Ipratropium Bromide 14
Ipratropium Bromide
14 claims
| Drug | Claims |
|---|---|
| Azelastine Hcl | 76 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 32 |
| Montelukast Sodium | 21 |
| Fluticasone Propionate | 19 |
| Wixela Inhub Fluticasone Propion/Salmeterol | 16 |
| Alvesco Ciclesonide | 15 |
| Ipratropium Bromide | 14 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Allergy & Immunology (Internal Medicine) Physician in CA →
All providers in California →
Compare specialties →
Allergy & Immunology (Internal Medicine) Physician Overview
How Steven Song, M.D. fits within the Allergy & Immunology (Internal Medicine) Physician landscape nationally.
517
Allergy & Immunology (Internal Medicine) Physician Providers in US
47
States with Allergy & Immunology (Internal Medicine) Physician
798
Avg Claims per Provider
Steven Song, M.D.'s 240 claims are below the specialty average of 798.
Nearby Allergy & Immunology (Internal Medicine) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Song.
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Allergy & Immunology (Internal Medicine) Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Steven Song, M.D.'s specialty? ▼
Steven Song, M.D. specializes in Allergy & Immunology (Internal Medicine) Physician and practices in Richmond, California. Credentials: M.D..
How much does Steven Song, M.D. prescribe under Medicare Part D? ▼
In 2023, Steven Song, M.D. wrote 240 Medicare Part D claims totaling $62K in drug costs for 71 beneficiaries.
Where is Steven Song, M.D. located? ▼
Steven Song, M.D. is located at 901 NEVIN AVE, Richmond, CA, 94801. Phone: (510) 307-1525.
What is Steven Song, M.D.'s NPI number? ▼
Steven Song, M.D.'s National Provider Identifier (NPI) is 1235251216, issued on 04/03/2007.
Does Steven Song, M.D. prescribe more brand-name or generic drugs? ▼
Steven Song, M.D.'s prescribing is 28% brand-name and 73% generic drugs by claim count, with $53K in brand drug costs.
How many Allergy & Immunology (Internal Medicine) Physician providers are there in the US? ▼
There are 517 Allergy & Immunology (Internal Medicine) Physician providers across 47 states in the US. The average Allergy & Immunology (Internal Medicine) Physician provider writes 798 Medicare Part D claims per year.
What drugs does Steven Song, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Steven Song, M.D.'s most frequently prescribed drugs include Azelastine Hcl, Albuterol Sulfate Hfa, Montelukast Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Steven Song, M.D. accept Medicare? ▼
Steven Song, M.D. appears in CMS Medicare data with 240 Part D claims and 71 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Steven Song, M.D.'s credentials? ▼
Steven Song, M.D.'s NPI is 1235251216 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.