Leif R Hass, M.D.
Family Practice · Hospitalist (CMS) · Oakland, CA
At a glance
350 Hawthorne Ave Rm 2346, Oakland, CA 94609-3108
NPPES record updated Apr 11, 2019. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
350 Hawthorne Ave Rm 2346Oakland, CA 94609-3108
Additional reported practice locations
12 Camino Encinas Fl 2Orinda, CA 945633304
Phone: 5102048166
Fax: 5105067724 4053 Lone Tree Way Ste 101
Antioch, CA 945316210
Phone: 9257563400
Fax: 5105067728 2850 Telegraph Ave Ste 130
Berkeley, CA 947051159
Phone: 5102048110
Fax: 5105067721 350 John Muir Pkwy Ste 105
Brentwood, CA 945135183
Phone: 9257767725
Fax: 5105067727 500 San Pablo Ave
Albany, CA 947061103
Phone: 5102048130
Fax: 5105067726 350 30Th St Ste 100
Oakland, CA 946093422
Phone: 5102048290
Fax: 5105067725 20101 Lake Chabot Rd Fl 3
Castro Valley, CA 945465305
Phone: 5108863400
Fax: 5105067729 12 Camino Encinas
Orinda, CA 945633304
Phone: 5102048180
Fax: 9252540687 2500 Milvia St
Berkeley, CA 947042636
Phone: 5102045600
Fax: 5102045462
Education & affiliations
- Medical / professional school
- Not reported in this file
- Graduation year
- 1993
- CMS specialties
- Family Practice · Hospitalist
Practice groups
Reported hospital affiliations
- Alta Bates Summit Medical Center Oakland, CA
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
No displayed procedure-category record in this release. This does not mean the clinician performs no procedures.
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $50.42 |
Reporting companies
| Company | Amount |
|---|---|
| AMGEN INC. | $50.42 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Family Practice · Hospitalist (CMS)
- Taxonomy code
- 208M00000X
- Enumeration date
- Aug 25, 2006
- Record updated
- Apr 11, 2019
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- M.D.
Reported taxonomies and licenses
208M00000X · Primary
License reported: G80367 CA
207Q00000X
License reported: G80367 CA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
350 Hawthorne Ave Rm 2346Oakland, CA 94609-3108
- Phone
- (510) 869-6883
Mailing address
2350 W EL CAMINO REALFL 2
MOUNTAIN VIEW, CA 940406203
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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