NPI registry status
Active
2026 NPPES data Hospitalist Physician NPI 1629431044 MD
Verify on CMS → Christopher Foss, MD
Hospitalist Physician in Santa Clarita, 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 17,950 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
1K
Medicare Part D claims · 153 beneficiaries · Hospitalist Physician avg: 940
Generic prescribing
83%
generic claims · 17% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
76.3/100
▼ 7 pts below national avg 83.5 · Above neutral
Industry payments
$1.4K
56 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Christopher Foss, MD reported a CMS MIPS final score of 76.3/100 - below the 83.5 national average - and filed 1,029 Medicare Part D claims in 2024.
- 76.3/100
- MIPS score · -7 vs avg
- 1K
- Part D claims, 2024
- 83%
- 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 Christopher Foss, MD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1629431044), first enumerated 04/02/2016.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,029 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)
Reported a CMS MIPS final score of 76.3/100 in the Quality Payment Program — a federal quality measure, not a patient review.
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
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
$1.4K in reported industry payments (56 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 Christopher Foss, MD'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 1629431044 · Hospitalist Physician
NPI-10 · ENUM-MID · TAX-MID · MIPS-BELOW · RX-MID · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1629431044
- ENUM-MID 2016
- TAX-MID 18K Hospitalist Physician
- MIPS-BELOW 76.3/100
- RX-MID 1,029
- BOOK-LIGHT 1,901 in California
- PHOTO-FINISH Niraj Karki, M.D. · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Farrukh Abbas, M…
Farrukh Abbas, MD
76.2 MIPS pts
- Mohammed Abdulgh…
Mohammed Abdulghani, MD
76.2 MIPS pts
- Foss · this prov…
Foss · this provider
76.3 MIPS pts
- Niraj Karki, M.D…
Niraj Karki, M.D.
76.3 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Christopher Foss, 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.
76 ≥ 17th percentile 17% 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 Christopher Foss, MD sits
This provider among hospitalist physician peers
Across the 4,317 hospitalist physician providers who report both Medicare Part D prescribing and a MIPS quality score, Christopher Foss, MD writes more Part D claims than 90% of them and scores higher on MIPS quality than 12% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one hospitalist physician peer from a representative sample of 60; the gold marker is Christopher Foss, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Christopher Foss, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Christopher Foss, MD?
Below national averagePrimary specialty
Hospitalist Physician
Medicare Part D claims
1,029 9% vs specialty avg
MIPS final score
76.3/100 7.2 pts vs avg
Specialty distribution in California
How Hospitalist Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Christopher Foss, MD's 2023 MIPS final score plotted against the Hospitalist Physician national average
- MIPS Final Score
- 76.3/100
- 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 | 1629431044 |
|---|---|
| Specialty | Hospitalist Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 04/02/2016 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
76.2631
Final Score
Measured-score avg: 83.5
62.7438
Quality
59.2967
Cost
Reporting: Group practice
Hospital and facility affiliations
Facilities where Christopher Foss, 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.
Usc Care Medical Group Inc
Los Angeles, 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 Christopher Foss, MD. Source: openpaymentsdata.cms.gov.
Total received
$1.4K
Largest payer
Lilly USA, LLC
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 Christopher Foss, MD. To verify Christopher Foss, 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
Christopher Foss, MD - brand share 17.0%
Hospitalist Physician average
17% brand-name claims vs 83% generic, on 1,029 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.
1,029
Total Claims
$1.8M
Total Drug Cost
153
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,378.167
- Total Day Supply
- 34,843
- Brand vs Generic
- 17% brand / 83% generic
- Brand Drug Cost
- $1.3M
- Generic Drug Cost
- $470K
- Opioid Claims
- 53 (5.2% rate)
- Antibiotic Claims
- 32
Patient Demographics
- Average Patient Age
- 74.7 years
- Avg HCC Risk Score
- 2.14
- Gender Split
- 63% female / 37% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Christopher Foss, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Anastrozole
Anastrozole
140 claims
- Prednisone
Prednisone
73 claims
- Eliquis 53
Eliquis
53 claims
- Loperamide 39
Loperamide
39 claims
- Abiraterone Acetate 32
Abiraterone Acetate
32 claims
- Lidocaine-Prilocaine 31
Lidocaine-Prilocaine
31 claims
- Acyclovir 30
Acyclovir
30 claims
- Lenalidomide 29
Lenalidomide
29 claims
| Drug | Claims |
|---|---|
| Anastrozole | 140 |
| Prednisone | 73 |
| Eliquis Apixaban | 53 |
| Loperamide Loperamide Hcl | 39 |
| Abiraterone Acetate | 32 |
| Lidocaine-Prilocaine Lidocaine/Prilocaine | 31 |
| Acyclovir | 30 |
| Lenalidomide | 29 |
| Mirtazapine | 27 |
| Alendronate Sodium | 24 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Hospitalist Physician Overview
How Christopher Foss, MD fits within the Hospitalist Physician landscape nationally.
17,950
Hospitalist Physician Providers in US
54
States with Hospitalist Physician
940
Avg Claims per Provider
Christopher Foss, MD's 1,029 claims are above the specialty average of 940.
Nationwide Hospitalist Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Foss, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (76.3 here).
Same NPPES enumeration year (2016)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Hospitalist Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Foss.
One of 1,901 Hospitalist Physician providers enrolled in California, 5 are shown here.
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 →
Frequently Asked Questions
What is Christopher Foss, MD's specialty? ▼
Christopher Foss, MD specializes in Hospitalist Physician and practices in Santa Clarita, California. Credentials: MD.
How much does Christopher Foss, MD prescribe under Medicare Part D? ▼
In 2024, Christopher Foss, MD wrote 1,029 Medicare Part D claims totaling $1.8M in drug costs for 153 beneficiaries.
What is Christopher Foss, MD's Medicare quality score? ▼
Christopher Foss, MD has a CMS MIPS Final Score of 76.3/100 (Quality: 62.7, Cost: 59.3). 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 Christopher Foss, MD located? ▼
Christopher Foss, MD is located at 25751 MCBEAN PKWY, Santa Clarita, CA, 91355. Phone: (661) 839-1801.
What is Christopher Foss, MD's NPI number? ▼
Christopher Foss, MD's National Provider Identifier (NPI) is 1629431044, issued on 04/02/2016.
Does Christopher Foss, MD prescribe more brand-name or generic drugs? ▼
Christopher Foss, MD's prescribing is 17% brand-name and 83% generic drugs by claim count, with $1.3M in brand drug costs.
Does Christopher Foss, MD prescribe opioids? ▼
Yes, Christopher Foss, MD had 53 opioid claims in 2024 with an opioid prescribing rate of 5.2%.
How many Hospitalist Physician providers are there in the US? ▼
There are 17,950 Hospitalist Physician providers across 54 states in the US. The average Hospitalist Physician provider writes 940 Medicare Part D claims per year.
What drugs does Christopher Foss, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Christopher Foss, MD's most frequently prescribed drugs include Anastrozole, Prednisone, Eliquis. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Christopher Foss, MD accept Medicare? ▼
Christopher Foss, MD appears in CMS Medicare data with 1,029 Part D claims and 153 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Christopher Foss, MD's credentials? ▼
Christopher Foss, MD's NPI is 1629431044 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 (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.