NPI registry status
Active
2026 NPPES data Hospitalist Physician NPI 1124107883 MD
Verify on CMS → John Kim, MD
Hospitalist Physician in Walnut Creek, 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 16,938 in Hospitalist 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
632
Medicare Part D claims · 221 beneficiaries · Hospitalist Physician avg: 888
Generic prescribing
80%
generic claims · 18% 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
John Kim, MD filed 632 Medicare Part D claims in 2023 as a Hospitalist Physician in Walnut Creek, California, prescribing 80% generic.
- 632
- Part D claims, 2023
- 80%
- 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.
John Kim, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
632 Top 31% higher than 69% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
John Kim, MD 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 John Kim, MD?
Quality data not reportedPrimary specialty
Hospitalist Physician
Medicare Part D claims
632 29% vs specialty avg
Specialty distribution in California
How Hospitalist 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 Hospitalist 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).
John Kim, MD appears in the CMS NPPES registry as a Hospitalist Physician provider holding MD credentials at 1425 S MAIN ST, Walnut Creek, CA, 94596, with a listed phone of (925) 295-4000. NPI 1124107883 was issued on 11/03/2006.
Medicare Part D records for calendar year 2023 show 632 prescription claims written by this provider, covering 221 Medicare beneficiaries and totaling roughly $29K in drug spend, split 18% brand-name and 80% generic by claim count, with an opioid prescribing rate of 2.8%.
Hospitalist Physician is a mid-sized specialty nationwide, with 16,938 enrolled providers across 54 states and an average of 888 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 | 1124107883 |
|---|---|
| Specialty | Hospitalist Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/03/2006 |
Hospital and facility affiliations
Facilities where John Kim, MD 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
Walnut Creek, 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 John Kim, MD. To verify John Kim, 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
John Kim, MD - brand share 18.0%
Hospitalist Physician average
18% brand-name claims vs 80% generic, on 632 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.
632
Total Claims
$29K
Total Drug Cost
221
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,022
- Total Day Supply
- 26,632
- Brand vs Generic
- 18% brand / 80% generic
- Brand Drug Cost
- $20K
- Generic Drug Cost
- $9K
- Opioid Claims
- 18 (2.8% rate)
- Antibiotic Claims
- 78
Patient Demographics
- Average Patient Age
- 78.7 years
- Avg HCC Risk Score
- 2.61
- Gender Split
- 48% female / 52% male
- Age Distribution
- <65: 12, 65-74: 54, 75-84: 97, 85+: 58
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What John Kim, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Furosemide
Furosemide
58 claims
- Cefpodoxime Proxetil
Cefpodoxime Proxetil
31 claims
- Atorvastatin Calcium 23
Atorvastatin Calcium
23 claims
- Metoprolol Tartrate 22
Metoprolol Tartrate
22 claims
- Amlodipine Besylate 17
Amlodipine Besylate
17 claims
- Carvedilol 16
Carvedilol
16 claims
- Pantoprazole Sodium 16
Pantoprazole Sodium
16 claims
- Isosorbide Mononit… 15
Isosorbide Mononitrate Er
15 claims
| Drug | Claims |
|---|---|
| Furosemide | 58 |
| Cefpodoxime Proxetil | 31 |
| Atorvastatin Calcium | 23 |
| Metoprolol Tartrate | 22 |
| Amlodipine Besylate | 17 |
| Carvedilol | 16 |
| Pantoprazole Sodium | 16 |
| Isosorbide Mononitrate Er Isosorbide Mononitrate | 15 |
| Metoprolol Succinate | 14 |
| Doxycycline Monohydrate | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Hospitalist Physician Overview
How John Kim, MD fits within the Hospitalist Physician landscape nationally.
16,938
Hospitalist Physician Providers in US
54
States with Hospitalist Physician
888
Avg Claims per Provider
John Kim, MD's 632 claims are below the specialty average of 888.
Nearby Hospitalist Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Kim.
Dr. Zina Abbas
M.D.
Chula Vista, CA
Dr. Mehrdad Abbasi
MD
Rancho Mirage, CA
Dr. Abdul Abdali
M.D.
French Camp, CA
Dr. Anwar Abdelhadi
M.D.
Orange, CA
Dr. Farid Abdelmalak
M.D.
Santa Monica, CA
Compare Hospitalist Physician nationally: see state-by-state distribution →
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 Hospitalist 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 John Kim, MD's specialty? ▼
John Kim, MD specializes in Hospitalist Physician and practices in Walnut Creek, California. Credentials: MD.
How much does John Kim, MD prescribe under Medicare Part D? ▼
In 2023, John Kim, MD wrote 632 Medicare Part D claims totaling $29K in drug costs for 221 beneficiaries.
Where is John Kim, MD located? ▼
John Kim, MD is located at 1425 S MAIN ST, Walnut Creek, CA, 94596. Phone: (925) 295-4000.
What is John Kim, MD's NPI number? ▼
John Kim, MD's National Provider Identifier (NPI) is 1124107883, issued on 11/03/2006.
Does John Kim, MD prescribe more brand-name or generic drugs? ▼
John Kim, MD's prescribing is 18% brand-name and 80% generic drugs by claim count, with $20K in brand drug costs.
Does John Kim, MD prescribe opioids? ▼
Yes, John Kim, MD had 18 opioid claims in 2023 with an opioid prescribing rate of 2.8%.
How many Hospitalist Physician providers are there in the US? ▼
There are 16,938 Hospitalist Physician providers across 54 states in the US. The average Hospitalist Physician provider writes 888 Medicare Part D claims per year.
What drugs does John Kim, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, John Kim, MD's most frequently prescribed drugs include Furosemide, Cefpodoxime Proxetil, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Kim, MD accept Medicare? ▼
John Kim, MD appears in CMS Medicare data with 632 Part D claims and 221 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Kim, MD's credentials? ▼
John Kim, MD's NPI is 1124107883 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.
- 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.