Active NPI 1619968021 Individual Practitioner Female Practitioner

Dr. Darby Annette Clayson , MD

Internal Medicine • San Francisco, CA

Professional Overview & Biography Verified Profile Summary

Dr. Darby Clayson, MD is a certified Internal Medicine practicing in San Francisco, CA. With approximately 28 years of clinical experience since graduating from Baylor College Of Medicine in 1998, Dr. Clayson delivers high-quality medical care to the local community at 1575 7TH AVE.

Dr. Clayson maintains professional affiliations with Vituity Hospitalists Pc, San Francisco Unified Physicians Group, Inc and does not directly accept Medicare assignment.

Frequently performed procedures and clinical services include subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least, subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least, subsequent hospital care with moderate levelof medical decision making, if using time, at least. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

1575 7th Ave

San Francisco, CA 941223704

Telephone 7024533799

Fax 7024535741

Associated Practice Facility / Clinic

🏢 Kindred Nursing Centers West, Llc Facility NPI 1215942065

Medicare Profile & Education

Medical School

Baylor College Of Medicine

Graduation Year

1998

Medicare Assignment

Not Specified

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in San Francisco, CA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

28 Yrs +7.2 yrs vs City Avg

City Avg: 20.8 Yrs

State Avg: 26.6 Yrs

Regional Practice Density

1374 Specialists

Practicing in San Francisco, CA (18502 Statewide)

Telehealth Adoption Rate

21.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

65.0% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Clayson (28 Years) 28 Yrs

San Francisco Specialty Average (20.8 Years) 20.8 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	585	186	$192.00	$123.95
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	412	146	$144.05	$85.95
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	221	123	$613.02	$131.28
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	143	65	$425.48	$87.25
99305 Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes	123	111	$272.00	$151.55
99310 Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes	103	62	$280.00	$175.73
99306 Initial nursing facility visit, typically 45 minutes per day	100	94	$345.00	$206.18
99315 Nursing facility discharge day management, 30 minutes or less	77	75	$154.00	$93.15
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	66	65	$1139.12	$190.70
99239 Hospital discharge day management, more than 30 minutes	44	43	$640.20	$129.22
99316 Nursing facility discharge management, more than 30 minutes	44	43	$221.00	$148.35
99304 Initial nursing facility care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes	12	12	$188.00	$90.94

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	528	157	$144.04	$85.16
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	528	172	$192.00	$122.00
99305 Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes	124	108	$272.00	$150.70
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	77	55	$588.73	$132.37
99306 Initial nursing facility visit, typically 45 minutes per day	76	74	$345.00	$205.65
99310 Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes	73	50	$280.00	$174.49
99316 Nursing facility discharge management, more than 30 minutes	55	51	$221.00	$147.93
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	54	52	$1041.39	$190.93
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	43	21	$392.77	$87.43
99315 Nursing facility discharge day management, 30 minutes or less	30	30	$154.00	$92.79
99239 Hospital discharge day management, more than 30 minutes	25	24	$619.24	$129.16

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	514	111	$144.00	$77.94
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	387	119	$192.80	$102.89
99306 Initial nursing facility visit, typically 45 minutes per day	105	96	$361.00	$184.41
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	83	80	$964.22	$215.43
99310 Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes	43	23	$280.00	$150.90
99305 Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes	40	38	$272.00	$144.20
99316 Nursing facility discharge management, more than 30 minutes	23	23	$236.39	$116.32
99220 Hospital observation care, typically 70 minutes	15	15	$806.73	$192.03
99315 Nursing facility discharge day management, 30 minutes or less	14	14	$188.86	$81.31
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	13	13	$416.77	$109.05
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	12	11	$144.00	$77.43

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	516	113	$144.00	$78.88
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	400	111	$192.00	$104.36
99306 Initial nursing facility visit, typically 45 minutes per day	115	97	$345.00	$188.21
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	57	57	$820.81	$222.67
99310 Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes	55	31	$280.00	$154.24
99305 Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes	37	33	$272.00	$146.82
99315 Nursing facility discharge day management, 30 minutes or less	32	32	$154.00	$82.93
99316 Nursing facility discharge management, more than 30 minutes	18	18	$215.67	$118.92
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	18	13	$130.83	$77.47
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	16	13	$245.19	$110.24

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	892	170	$192.45	$79.81
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	633	158	$224.28	$105.48
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	125	46	$291.42	$79.50
99315 Nursing facility discharge day management, 30 minutes or less	107	104	$200.43	$84.07
99306 Initial nursing facility visit, typically 45 minutes per day	105	98	$363.10	$190.65
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	89	52	$440.91	$116.24
99310 Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes	63	40	$280.00	$154.98
99305 Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes	59	55	$272.00	$148.42
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	36	36	$876.67	$225.11
99316 Nursing facility discharge management, more than 30 minutes	31	31	$221.00	$120.62
99497 Advance care planning, first 30 minutes	23	20	$171.00	$89.48
99238 Hospital discharge day management, 30 minutes or less	15	14	$347.93	$82.99
99490 Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month	13	13	$73.00	$36.26
99239 Hospital discharge day management, more than 30 minutes	12	12	$227.75	$112.36

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	874	228	$322.00	$105.09
99306 Initial nursing facility visit, typically 45 minutes per day	256	228	$520.16	$187.69
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	252	95	$146.32	$104.00
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	185	77	$106.91	$78.26
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	127	61	$238.76	$80.88
99310 Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes	120	57	$269.17	$152.93
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	118	73	$244.00	$79.19
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	79	50	$342.67	$115.69
99305 Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes	45	40	$305.80	$146.41
99316 Nursing facility discharge management, more than 30 minutes	45	44	$365.62	$120.27
99310 Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes	42	33	$478.00	$155.19
99316 Nursing facility discharge management, more than 30 minutes	37	37	$173.03	$119.04
99231 Follow-up hospital inpatient care per day, typically 15 minutes	28	21	$133.36	$43.69
99315 Nursing facility discharge day management, 30 minutes or less	25	24	$136.60	$83.05
99221 Initial hospital inpatient care per day, typically 30 minutes	18	18	$344.00	$112.47
99490 Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month	18	18	$152.00	$48.87
99315 Nursing facility discharge day management, 30 minutes or less	11	11	$255.00	$83.92

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	1,704	255	$322.00	$102.65
99306 Initial nursing facility visit, typically 45 minutes per day	147	141	$524.43	$184.45
99316 Nursing facility discharge management, more than 30 minutes	84	77	$370.00	$117.91
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	78	56	$221.03	$78.32
99310 Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes	52	41	$478.00	$152.30
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	44	43	$402.82	$215.66
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	24	24	$385.54	$147.96
99305 Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes	20	20	$408.00	$144.65
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	16	15	$313.19	$112.12
99221 Initial hospital inpatient care per day, typically 30 minutes	14	14	$344.00	$109.84
99239 Hospital discharge day management, more than 30 minutes	14	14	$209.86	$108.90
99220 Hospital observation care, typically 70 minutes	13	13	$486.92	$195.64

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99306 Initial nursing facility visit, typically 45 minutes per day	132	127	$538.00	$183.59
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	121	79	$297.00	$101.74
99497 Advance care planning, first 30 minutes	118	115	$271.00	$89.99
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	70	69	$458.57	$213.07
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	66	47	$183.86	$106.32
99490 Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month	55	49	$100.00	$48.11
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	51	36	$125.00	$98.11
99310 Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes	47	37	$439.00	$150.80
99306 Initial nursing facility visit, typically 45 minutes per day	34	34	$349.85	$182.70
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	31	28	$121.29	$73.70
99239 Hospital discharge day management, more than 30 minutes	31	31	$197.42	$110.32
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	26	21	$141.19	$74.60
99497 Advance care planning, first 30 minutes	22	22	$155.95	$83.42
99490 Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month	21	21	$73.00	$32.87
99220 Hospital observation care, typically 70 minutes	19	19	$375.05	$191.38
99316 Nursing facility discharge management, more than 30 minutes	18	18	$339.00	$116.45
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	14	12	$225.00	$76.85
99217 Hospital observation care on day of discharge	11	11	$237.27	$75.23

Medical Specialties & State Licenses

CMS Verified: 2026-02-27

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License CA A139455

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Military Health Care Provider

NUCC Taxonomy Code: 171000000X

State License NV 11502

Active duty military health care providers not otherwise classified who need to be separately identified for operational, clinical, or administrative processes.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License NV 11502

Hospital & Practice Group Affiliations

San Francisco Unified Physicians Group, Inc

845 Jackson St, San Francisco, CA 941334851

Phone: 4157798868

Vituity Hospitalists Pc

900 Hyde St, San Francisco, CA 941094806

Phone: 4153536000

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

36 Associated Practitioners

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Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

15 Historical Events

📍

Updated Practice Location February 27, 2026

Registered at 1575 7TH AVE, SAN FRANCISCO, CA 941223704 (Tel: 7024533799)

📍

Updated Business Mailing Address February 27, 2026

Registered at PO BOX 31085, SAN FRANCISCO, CA 941310085 (Tel: 7024533799)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) December 04, 2019

Internal Medicine (License #A139455 in CA)

✅

NPI Profile Active August 30, 2017

NPI status registered as active in NPPES database

📍

Updated Practice Location August 30, 2017

Registered at 1900 SULLIVAN AVE, LOWER LEVEL, DALY CITY, CA 94015 (Tel: 4156804135)

📍

Updated Business Mailing Address August 30, 2017

Registered at 1900 SULLIVAN AVE, LOWER LEVEL, DALY CITY, CA 94015 (Tel: (415) 680-4135)

👤

Provider Name / Credentials Updated August 30, 2017

Recorded as DARBY CLAYSON, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) August 30, 2017

Military Health Care Provider (License #11502 in NV)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) August 30, 2017

Internal Medicine (License #11502 in NV)

✅

NPI Profile Active January 12, 2016

NPI status registered as active in NPPES database

📍

Updated Practice Location January 12, 2016

Registered at 1107 US HIGHWAY 395 N, GARDNERVILLE, NV 894105304 (Tel: 7024533799)

📍

Updated Business Mailing Address January 12, 2016

Registered at 5214F DIAMOND HEIGHTS BLVD # 736, SAN FRANCISCO, CA 941312175 (Tel: 7024533799)

👤

Provider Name / Credentials Updated January 12, 2016

Recorded as DARBY CLAYSON, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) January 12, 2016

Internal Medicine (License #11502 in NV)

🟢

Initial NPI Registration & Enumeration November 03, 2005

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1619968021

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: November 03, 2005

Last Update: February 27, 2026

Sole Proprietor: Yes

Update or Correct Profile

Mailing Address

Po Box 31085

San Francisco, CA 941310085

Phone: 7024533799

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.