Physician Profile
Unclaimed ProfileAbout TAN
Based in Los Angeles, CA, Ann Zera Tan, M.D. is listed in the NPI registry under pathology. Ann is also listed as specializing in anatomic & clinical pathology. According to Medicare claims data, Ann cared for 650 Medicare patients across 1,205 services.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (323) 226-7149
- Email not available
Practice Locations
1200 N STATE ST LOS ANGELES COUNTY MEDICAL CENTER, GH ROOM 2900
Los Angeles, CA 90033
Procedures Most Often Billed to Medicare
1,205 services · 650 patients · 13 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Pathology examination of tissue using a microscope, intermediate complexity | Lab test | 88305 |
503 |
| Pathology examination of specimen during surgery, first tissue block | Lab test | 88331 |
161 |
| Special stained specimen slides to examine tissue, each additional procedure | Lab test | 88341 |
147 |
| Preparation of tissue for examination by removing any calcium present | Lab test | 88311 |
92 |
| Pathology examination of tissue using a microscope, moderately low complexity | Lab test | 88304 |
74 |
| Special stained specimen slides to examine tissue, initial procedure | Lab test | 88342 |
44 |
| Blood smear interpretation by physician with written report | Lab test | 85060 |
43 |
| Pathology examination of tissue using a microscope, moderately high complexity | Lab test | 88307 |
33 |
| Pathology examination of tissue using a microscope, limited examination | Lab test | 88300 |
28 |
| Cell examination of specimen, selective cellular enhancement technique | Lab test | 88112 |
23 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other pathology specialists in Los Angeles 8
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
More connections — 8 related providers in 1 group
Class of 2008 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Dr. Tan specialize in?
Dr. Tan is a pathology in Los Angeles, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “PATHOLOGY”.
NPI registry
Where is Dr. Tan located?
Dr. Tan is listed at 1200 N STATE ST LOS ANGELES COUNTY MEDICAL CENTER, GH ROOM 2900, Los Angeles, CA 90033. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Tan's phone number?
The number on file is (323) 226-7149. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Tan's NPI number?
Dr. Tan's National Provider Identifier is 1093976938. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Tan go to medical school?
Dr. Tan attended Other, graduating in 2008. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Tan been practicing?
Dr. Tan has 18 years experience. Calculated from a graduation year of 2008, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Tan do most often?
According to Medicare billing data, Dr. Tan the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Tan confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Tan. If this is you, claiming it is free.
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Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.