Active NPI 1275893752 Individual Practitioner Female Practitioner

Dr. Sidney H Allison , MD

Internal Medicine • Seattle, WA

Professional Overview & Biography Verified Profile Summary

Dr. Sidney Allison, MD is a certified Internal Medicine practicing in Seattle, WA. With approximately 14 years of clinical experience since completing medical education in 2012, Dr. Allison delivers high-quality medical care to the local community at 747 BROADWAY.

Dr. Allison maintains professional affiliations with American Specialty Physicians Group Inc, San Francisco Unified Physicians Group, Inc, University Of California Sfgh Medical Group and does not directly accept Medicare assignment.

Frequently performed procedures and clinical services include subsequent hospital care with moderate levelof medical decision making, if using time, at least, initial hospital care with moderate level of medical decision making, if using time, at least, initial hospital care with straightforward or low-level 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

747 Broadway

Seattle, WA 981224379

Telephone 2062152520

Fax 2063863180

Associated Practice Facility / Clinic

🏢 Swedish Health Services Facility NPI 1053362327

Medicare Profile & Education

Medical School

Other

Graduation Year

2012

Medicare Assignment

Not Specified

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Seattle, WA

Established Specialist (10-20 Yrs)

Practitioner Clinical Experience

14 Yrs -6.3 yrs vs City Avg

City Avg: 20.3 Yrs

State Avg: 23.4 Yrs

Regional Practice Density

839 Specialists

Practicing in Seattle, WA (3169 Statewide)

Telehealth Adoption Rate

26.1% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

53.0% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Allison (14 Years) 14 Yrs

Seattle Specialty Average (20.3 Years) 20.3 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
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	192	50	$217.21	$131.31
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	83	82	$425.59	$166.39
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	43	19	$163.33	$86.66
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	17	17	$267.00	$120.48

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	265	44	$346.51	$132.40
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	91	91	$458.71	$166.69
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	16	16	$287.00	$121.47

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	515	73	$347.00	$113.47
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	87	85	$440.02	$188.99
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	59	21	$243.00	$79.21

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	538	81	$345.49	$113.84
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	179	177	$390.63	$193.15
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	37	16	$242.46	$79.78
99291 Critical care, first 30-74 minutes	25	23	$563.92	$217.24
99239 Hospital discharge day management, more than 30 minutes	17	14	$351.82	$118.80
99220 Hospital observation care, typically 70 minutes	14	14	$305.00	$172.24

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	454	118	$327.52	$114.58
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	178	174	$359.85	$197.53
99291 Critical care, first 30-74 minutes	52	45	$443.75	$215.11
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	40	21	$235.50	$80.48
99239 Hospital discharge day management, more than 30 minutes	20	20	$276.40	$113.52
99220 Hospital observation care, typically 70 minutes	18	18	$305.00	$170.62

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	510	124	$319.27	$113.75
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	255	250	$356.59	$193.73
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	131	57	$222.39	$79.68
99291 Critical care, first 30-74 minutes	72	65	$508.38	$216.54
99220 Hospital observation care, typically 70 minutes	22	22	$305.00	$176.28
99239 Hospital discharge day management, more than 30 minutes	11	11	$332.00	$119.49

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	394	369	$345.92	$193.21
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	215	81	$214.28	$76.83
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	158	101	$271.08	$104.32
99220 Hospital observation care, typically 70 minutes	55	54	$309.20	$177.13
99238 Hospital discharge day management, 30 minutes or less	30	30	$175.87	$72.22
99291 Critical care, first 30-74 minutes	26	25	$419.00	$210.73

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	136	53	$211.00	$99.40
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	64	63	$586.70	$222.53
99238 Hospital discharge day management, 30 minutes or less	23	23	$124.00	$69.03
99221 Initial hospital inpatient care per day, typically 30 minutes	11	11	$318.64	$112.39

Medical Specialties & State Licenses

CMS Verified: 2026-02-10

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License WA MD60476243

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.

Hospitalist

NUCC Taxonomy Code: 208M00000X

State License WA MD60476243

Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

2029080 (WA)

Hospital & Practice Group Affiliations

American Specialty Physicians Group Inc

173 E Webster St, Colusa, CA 959322949

Phone: 2092876308

San Francisco Unified Physicians Group, Inc

845 Jackson St, San Francisco, CA 941334851

Phone: 4157798868

Swedish Health Services

747 Broadway, Seattle, WA 981224379

Phone: 2063866000

Valley Medical Group-Renton

400 S 43rd St, Renton, WA 980555714

Phone: 4252283450

University Of California Sfgh Medical Group

1001 Potrero Ave, San Francisco, CA 941103518

Phone: 6282064774

Practice Associates & Co-Workers

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

40 Associated Practitioners

Dr. Mohammad Anindo , MD

Internal Medicine

NPI 1003299876

Doctor of Medicine (M.D.)

Dr. Richard Kadera , MD

Hospitalist

NPI 1003867284

Doctor of Medicine (M.D.)

Dr. Robert Hansen , MD

Hospitalist

NPI 1003979055

Doctor of Medicine (M.D.)

Dr. Elizabeth Potter , MD

Internal Medicine

NPI 1013172097

Doctor of Medicine (M.D.)

Kellie Matson , PA-C

Physician Assistant

NPI 1013681451

Physician Assistant (Certified)

Dr. Brandon Ong , MD

Hospitalist

NPI 1013968072

Doctor of Medicine (M.D.)

Career & Practice History Timeline

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

23 Historical Events

📍

Updated Practice Location February 10, 2026

Registered at 747 BROADWAY, SEATTLE, WA 981224379 (Tel: 2062152520)

📍

Updated Business Mailing Address February 10, 2026

Registered at PO BOX 25608, SALT LAKE CITY, UT 841250608 (Tel: 2063204476)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) February 10, 2026

Internal Medicine (License #MD60476243 in WA)

📍

Updated Practice Location April 14, 2025

Registered at 1001 POTRERO AVE BLDG 25, SAN FRANCISCO, CA 941103518 (Tel: 6282068000)

📍

Updated Business Mailing Address April 14, 2025

Registered at 450 STANYAN ST FL 6, SAN FRANCISCO, CA 941171019

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) April 14, 2025

Anesthesiology (License #MD60476243 in WA)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) July 21, 2022

Internal Medicine (License #138279 in CA)

📍

Updated Practice Location July 06, 2021

Registered at 1701 N SENATE BLVD # B335, INDIANAPOLIS, IN 462021239 (Tel: 3179628776)

📍

Updated Business Mailing Address July 06, 2021

Registered at 250 N SHADELAND AVE, INDIANAPOLIS, IN 462194959

✅

NPI Profile Active September 13, 2017

NPI status registered as active in NPPES database

📍

Updated Practice Location September 13, 2017

Registered at 1500 RED RIVER ST, AUSTIN, TX 787011918 (Tel: (512) 324-7863)

📍

Updated Business Mailing Address September 13, 2017

Registered at 1500 RED RIVER ST, AUSTIN, TX 787011918 (Tel: (512) 324-7863)

👤

Provider Name / Credentials Updated September 13, 2017

Recorded as SIDNEY ALLISON, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) September 13, 2017

Anesthesiology (License #MD60476243 in WA)

📍

Updated Business Mailing Address August 24, 2017

Registered at 1559B SLOAT BLVD, SAN FRANCISCO, CA 941321222 (Tel: 5123247863)

📍

Updated Practice Location August 04, 2017

Registered at 1559B SLOAT BLVD STE 204, SAN FRANCISCO, CA 941321222 (Tel: 4150000000)

📍

Updated Business Mailing Address August 04, 2017

Registered at 2100 POWELL ST STE 900, EMERYVILLE, CA 946081844 (Tel: (512) 324-7863)

✅

NPI Profile Active June 12, 2015

NPI status registered as active in NPPES database

📍

Updated Practice Location June 12, 2015

Registered at 601 E 15TH ST, UNIVERSITY OF TEXAS AT AUSTIN- DMS INTERNAL MEDICINE, AUSTIN, TX 787011930 (Tel: 5123247863)

📍

Updated Business Mailing Address June 12, 2015

Registered at 601 E 15TH ST, UNIVERSITY OF TEXAS AT AUSTIN - DMS INTERNAL MEDICINE, AUSTIN, TX 787011930 (Tel: 5123247863)

👤

Provider Name / Credentials Updated June 12, 2015

Recorded as SIDNEY ALLISON, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) June 12, 2015

Anesthesiology (License #MD60476243 in WA)

🟢

Initial NPI Registration & Enumeration May 18, 2012

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: 1275893752

Entity Type:

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

Enumeration Date: May 18, 2012

Last Update: February 10, 2026

Sole Proprietor: No

Update or Correct Profile

Mailing Address

Po Box 25608

Salt Lake City, UT 841250608

Phone: 2063204476

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.