Physician Profile
Karen R. Johnston, MD
Unclaimed ProfileAbout Dr. Johnston
Karen R. Johnston, MD is a healthcare provider in Palo Alto, CA specializing in pathology. Karen is also listed as specializing in anatomic & clinical pathology. Medicare claims data shows Karen provided 1,630 services to 620 patients. The services billed most often include subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more, subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes, and initial nursing facility care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (650) 380-9149
- Email not available
Practice Locations
478 E CHARLESTON RD
Palo Alto, CA 94306
Conditions Evaluated or Diagnosed
Within Pathology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Autoimmune & Joints
Autopsy & Forensic
- Unexplained Cause of Death
Blood & Metabolism
- Vitamin D deficiency
Blood Disorders
- Bleeding Disorders
- Blood Clotting Gene Mutation
- Iron-deficiency anemia
- Leukemia
- Lymphoma
- Multiple Myeloma
- Sickle cell disease
Cancer
- Bladder cancer
- Bone tumors
- Brain tumor
- Breast cancer
- Cervical cancer
- Colon cancer
- Endometrial cancer
- Kidney cancer
- Liver cancer
- Lung cancer
- Oral cavity cancer
- Ovarian cancer
- Pancreatic cancer
- Prostate cancer
- Soft-tissue sarcoma
- Stomach cancer
- Testicular cancer
- Thyroid cancer
Cervical & Gynecologic
- Abnormal cervical cells and cervical dysplasia
- Endometrial hyperplasia
Digestive
- Gallbladder inflammation
- H. pylori infection
Digestive System
- Barrett's esophagus
- Celiac disease
- Colon polyps
Endocrine
Genetics
- Inherited Cancer Risk
Hormones
- Testosterone deficiency
Immune System
- Autoimmune Diseases
Infections
- Hepatitis C
- Lyme disease
- Mononucleosis
- Sexually transmitted infections
Kidney
- Kidney Disease
Liver
Metabolic & Routine Lab
- Diabetes
- Gout
- High cholesterol
Pregnancy & Fertility
Skin Cancer
- Melanoma
- Moles and atypical moles
- Skin cancer
Women's Health
Procedures & services
Autopsy & Forensic
- Private Autopsy Service
Blood Tests
- Blood Clotting Tests
- Blood Type Test
- Cholesterol screening
- Complete Blood Count
- Comprehensive Metabolic Panel
- Hemoglobin A1c Test
- Iron Level Blood Test
- Thyroid Blood Test
Cytology
- Body fluid cytology
- Urine cytology test
Cytology & Screening
- Fine-needle aspiration of a neck mass
- Human papillomavirus testing
- Pap Smear Test
- Thyroid Nodule Biopsy Review
Genetic & Molecular Tests
- Cancer Genetic Testing
- Liquid Biopsy
- Paternity DNA Test
- Tumor Biomarker Testing
Genetics
- Chromosome And Genetic Testing
Immune & Allergy Tests
- Allergy Blood Testing
- Autoimmune Antibody Panel
- Celiac Disease Blood Test
Infection Testing
- Blood Culture Test
- H. Pylori Breath Test
- Lyme disease test
Infection Tests
- STI Screening Panel
Lab & Blood Tests
- Cardiac enzyme blood test
- Pregnancy blood test
- Sed rate inflammation test
- Testosterone blood test
- Vitamin D blood test
Pathology Review
- Biopsy Second Opinion
- Frozen Section During Surgery
Pregnancy & Fertility
- Miscarriage tissue testing
- Placenta examination
- Sperm count test
Routine Lab Tests
- Colon cancer screening consult
- Urinalysis
- Urine Drug Screen
Tissue Biopsy
- Bone Marrow Biopsy Interpretation
- Breast Biopsy Analysis
- Cervical biopsy lab review
- Colon Polyp Testing
- Kidney Biopsy Examination
- Liver Biopsy Examination
- Lung biopsy lab review
- Lymph Node Biopsy Analysis
- Oral biopsy lab review
- Prostate Biopsy Analysis
- Skin Biopsy Lab Review
- Stomach biopsy lab review
- Uterine biopsy lab review
Procedures Most Often Billed to Medicare
1,630 services · 620 patients · 7 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more | Office visit | 99308 |
924 |
| Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes | Office visit | 99307 |
353 |
| Initial nursing facility care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99304 |
158 |
| Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes | Office visit | 99309 |
85 |
| Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more | Office visit | 99308 |
72 |
| Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes | Office visit | 99307 |
20 |
| Initial nursing facility care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99304 |
18 |
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.
Other pathology specialists in Palo Alto 8
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1988 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What is Dr. Johnston's specialty?
Dr. Johnston is a pathology in Palo Alto, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where can I find Dr. Johnston?
Dr. Johnston is listed at 478 E Charleston Rd, Palo Alto, CA 94306. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Johnston?
The number on file is (650) 380-9149. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Johnston?
Dr. Johnston's National Provider Identifier is 1326518325. 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
What is Dr. Johnston's medical education?
Dr. Johnston attended Other, graduating in 1988. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Johnston have?
Dr. Johnston has 38 years experience. Calculated from a graduation year of 1988, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Johnston known for?
According to Medicare billing data, Dr. Johnston 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
Is Dr. Johnston's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Johnston. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.