Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Janaki N. Ramanathan, MD

Individual provider Diagnostic Radiology Physician · NPI 1275611873

Janaki N. Ramanathan, MD practises Diagnostic Radiology in San Francisco, California. Graduated from University of Texas Medical Branch at Galveston in 1998, 28 years ago. Practices with North Star Gv LP, a 21-clinician group, works from 12 locations and accepts Medicare assignment. Licensed in Alaska, Arizona, California and Colorado and 10 more.

Years since qualifying
28
Trained at
University of Texas Medical Branch at Galveston
Licensed in
AK, AZ, CA, CO, IL, MT
In the registry since
2006
Specialties on file
15
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2351 Clay St Ste 100
San Francisco, CA 94115-1931
Phone: (415) 600-3143
Fax: (415) 600-3123
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (11)

  • 3301 El Camino Real Ste 100, Atherton, CA 94027-3803 — (650) 364-3080
  • 250 Bon Air Rd, Greenbrae, CA 94904-1702 — (415) 925-7301
  • 180 Rowland Way, Novato, CA 94945-5009 — (415) 209-1500
  • 180 Rowland Way, Novato, CA 94945-5009 — (415) 209-1500
  • 1101 Van Ness Ave Fl 3, San Francisco, CA 94109-6919 — (415) 600-3232
  • 347 Andrieux St, Sonoma, CA 95476-6811 — (707) 935-5265
  • 181 W Meadow Dr Ste 100, Vail, CO 81657-5058 — (970) 479-7252
  • 2808 S 143rd Plz, Omaha, NE 68144-5611 — (402) 609-1800
  • 555 Kinderkamack Rd, Oradell, NJ 07649-1517 — (201) 488-2660
  • 2351 E 22nd St, Cleveland, OH 44115-3111 — (213) 363-2677
  • 2408 E 81st St Ste 900, Tulsa, OK 74137-4283 — (918) 477-5000

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence A80398 (CA)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 25MA08403700 (NJ)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 248102 (NY)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 25.000109 (OH)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 25945 (OK)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 49037 (WA)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence K7874 (TX)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 24315 (NE)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 11524 (MT)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence MEDS6218 (AK)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 38047 (AZ)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 46252 (CO)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 12619 (NV)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 036.119210 (IL)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 4516 (AK)

Record details

NPI number1275611873
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 1, 2006
Last updated in NPPESSeptember 23, 2020
Certification dateSeptember 23, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolUNIVERSITY OF TEXAS MEDICAL BRANCH AT GALVESTON
Graduated 1998 (28 years in practice)
Group practice North Star Gv Lp — 21 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients15
Services billed 15 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at North Star Gv LP

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 21 clinicians in the practice; 4 are shown here.

Other providers in San Francisco