Hospital Services
North Shore Hospital Campus
Shakespeare Road, Takapuna

Private Bag 93-503, Takapuna

Auckland 0740

Telephone:  09 489 0527

14 February 2022

Paul Blackham
Via email: [FYI request #18360 email]

Dear Paul

Re: OIA request – Heart-related issues

Thank you for your Official Information Act request, received 28 January, seeking the following
information from Waitematā District Health Board (DHB):

I am seeking the number of people that have visited any/all hospitals and doctor's surgeries within
Waitematā DHB for any/all heart related issues, (including but not limited to pericarditis,
myocarditis, heart attacks and strokes).

The data requested is for the 11 month period from February 2021 until December 2021 inclusive,
displayed in month by month format, and compared to the monthly data for the previous three
years.

In response to your request, we are able to provide the following information:

Please note this is hospital data as diagnoses is only made in a secondary setting following referral
from a primary care provider. If the GP suspects a heart condition, they will refer the patient to the
specialist service (cardiology) at North Shore Hospital, where a diagnosis will be made.

The data requested is included in Attachment 1.

A list of the ICD (international classification of condition) codings and corresponding descriptions of
the conditions that have been included in the data - please refer to Attachment 2.

A slight decline in the numbers in April 2020 is attributable to the first COVID-19 Alert Level 4
lockdown at that time.

I trust that this information is helpful.

Waitematā DHB supports the open disclosure of information to assist community understanding of
how we are delivering publicly funded healthcare.

This includes the proactive publication of anonymised Official Information Act responses on our
website from 10 working days after they have been released.

1

If you consider there are good reasons why this response should not be made publicly available, we
will be happy to consider your views.

Yours sincerely

Mark Shepherd
Executive Director Hospital Services
Waitematā District Health Board

2

Attachment 1

Records confirming the diagnosis of heart or stroke conditions are held by the DHB as follows:

Total discharges of Waitematā DHB patients with heart-related issues from 2018 to 2021 broken down by month

Year
Month
Total
Year
Month
Total
Year
Month
Total
Year
Month
Total
2018  Jan
1,149
2019  Jan
1,263
2020  Jan
1,129
2021  Jan
1,197


Feb
1,165

Feb
1,117

Feb
999

Feb
1,038


Mar
1,322

Mar
1,340

Mar
1,054

Mar
1,211


Apr
1,183

Apr
1,243

Apr
750

Apr
1,239


May
1,403

May
1,427

May
1,076

May
1,308


Jun
1,353

Jun
1,226

Jun
1,217

Jun
1,293


Jul
1,399

Jul
1,264

Jul
1,396

Jul
1,413


Aug
1,500

Aug
1,272

Aug
1,278

Aug
1,262


Sep
1,371

Sep
1,126

Sep
1,321

Sep
1,099


Oct
1,329

Oct
1,136

Oct
1,262

Oct
1,134


Nov
1,406

Nov
1,151

Nov
1,215

Nov
1,230


Dec
1,246

Dec
1,088

Dec
1,234

Dec
1,149
2018 Total
15,826
  2019 Total
14,653
  2020 Total
13,931
  2021 Total
14,573

3

Attachment 2 - ICD codes for heart-related issues
ICD code
ICD short description
I010
Acute rheumatic pericarditis
I029
Rheumatic chorea without heart involvement
I058
Other mitral valve diseases
I069
Rheumatic aortic valve disease, unspecified
I079
Tricuspid valve disease, unspecified
I092
Chronic rheumatic pericarditis
I098
Other specified rheumatic heart diseases
I119
Hypertensive heart disease without (congestive) heart failure
I120
Hypertensive kidney disease with kidney failure
I151
Hypertension secondary to other kidney disorders
I158
Other secondary hypertension
I212
Acute transmural myocardial infarction of other sites
I214
Acute subendocardial myocardial infarction
I221
Subsequent myocardial infarction of inferior wall
I228
Subsequent myocardial infarction of other sites
I230
Haemopericardium as current complication following acute myocardial infarction
I241
Dressler's syndrome
I254
Coronary artery aneurysm and dissection
I256
Silent myocardial ischaemia
I00
Rheumatic fever without mention of heart involvement
I012
Acute rheumatic myocarditis
I019
Acute rheumatic heart disease, unspecified
I061
Rheumatic aortic insufficiency
I068
Other rheumatic aortic valve diseases
I259
Chronic ischaemic heart disease, unspecified
I280
Arteriovenous fistula of pulmonary vessels
I281
Aneurysm of pulmonary artery
I289
Disease of pulmonary vessels, unspecified
I310
Chronic adhesive pericarditis
I321
Pericarditis in other infectious and parasitic diseases classified elsewhere
I341
Mitral (valve) prolapse
I070
Tricuspid stenosis
I071
Tricuspid insufficiency
I072
Tricuspid stenosis with insufficiency
Page 1 of 7

ICD code
ICD short description
I078
Other tricuspid valve diseases
I080
Disorders of both mitral and aortic valves
I088
Other multiple valve diseases
I091
Rheumatic diseases of endocardium, valve unspecified
I10
Essential (primary) hypertension
I139
Hypertensive heart and kidney disease, unspecified
I150
Renovascular hypertension
I342
Nonrheumatic mitral (valve) stenosis
I348
Other nonrheumatic mitral valve disorders
I358
Other aortic valve disorders
I360
Nonrheumatic tricuspid (valve) stenosis
I371
Pulmonary valve insufficiency
I379
Pulmonary valve disorder, unspecified
I390
Mitral valve disorders in diseases classified elsewhere
I401
Isolated myocarditis
I208
Other forms of angina pectoris
I209
Angina pectoris, unspecified
I211
Acute transmural myocardial infarction of inferior wall
I231
Atrial septal defect as current complication following acute myocardial infarction
I235
Rupture of papillary muscle as current complication following acute myocardial infarction
I238
Other current complications following acute myocardial infarction
I411
Myocarditis in viral diseases classified elsewhere
I421
Obstructive hypertrophic cardiomyopathy
I425
Other restrictive cardiomyopathy
I432
Cardiomyopathy in nutritional diseases
I444
Left anterior fascicular block
I447
Left bundle-branch block, unspecified
I451
Other and unspecified right bundle-branch block
I454
Nonspecific intraventricular block
I461
Sudden cardiac death, so described
I470
Re-entry ventricular arrhythmia
I249
Acute ischaemic heart disease, unspecified
I255
Ischaemic cardiomyopathy
I271
Kyphoscoliotic heart disease
I278
Other specified pulmonary heart diseases
I279
Pulmonary heart disease, unspecified
Page 2 of 7

ICD code
ICD short description
I288
Other specified diseases of pulmonary vessels
I300
Acute nonspecific idiopathic pericarditis
I479
Paroxysmal tachycardia, unspecified
I480
Paroxysmal atrial fibrillation
I482
Chronic atrial fibrillation
I483
Typical atrial flutter
I491
Atrial premature depolarisation
I493
Ventricular premature depolarisation
I499
Cardiac arrhythmia, unspecified
I501
Left ventricular failure
I511
Rupture of chordae tendineae, not elsewhere classified
I516
Cardiovascular disease, unspecified
I521
Other heart disorders in other infectious and parasitic diseases classified elsewhere
I301
Infective pericarditis
I312
Haemopericardium, not elsewhere classified
I320
Pericarditis in bacterial diseases classified elsewhere
I339
Acute endocarditis, unspecified
I351
Aortic (valve) insufficiency
I361
Nonrheumatic tricuspid (valve) insufficiency
I394
Multiple valve disorders in diseases classified elsewhere
I011
Acute rheumatic endocarditis
I020
Rheumatic chorea with heart involvement
I050
Mitral stenosis
I052
Mitral stenosis with insufficiency
I059
Mitral valve disease, unspecified
I060
Rheumatic aortic stenosis
I062
Rheumatic aortic stenosis with insufficiency
I082
Disorders of both aortic and tricuspid valves
I090
Rheumatic myocarditis
I601
Subarachnoid haemorrhage from middle cerebral artery
I604
Subarachnoid haemorrhage from basilar artery
I609
Subarachnoid haemorrhage, unspecified
I633
Cerebral infarction due to thrombosis of cerebral arteries
I639
Cerebral infarction, unspecified
I423
Endomyocardial (eosinophilic) disease
I424
Endocardial fibroelastosis
Page 3 of 7

ICD code
ICD short description
I426
Alcoholic cardiomyopathy
I427
Cardiomyopathy due to drugs and other external agents
I429
Cardiomyopathy, unspecified
I438
Cardiomyopathy in other diseases classified elsewhere
I443
Other and unspecified atrioventricular block
I131
Hypertensive heart and kidney disease with kidney failure
I132
Hypertensive heart and kidney disease with both (congestive) heart failure and kidney failure
I152
Hypertension secondary to endocrine disorders
I159
Secondary hypertension, unspecified
I201
Angina pectoris with documented spasm
I210
Acute transmural myocardial infarction of anterior wall
I213
Acute transmural myocardial infarction of unspecified site
I452
Bifascicular block
I453
Trifascicular block
I455
Other specified heart block
I469
Cardiac arrest, unspecified
I471
Supraventricular tachycardia
I481
Persistent atrial fibrillation
I489
Atrial fibrillation and atrial flutter, unspecified
I490
Ventricular fibrillation and flutter
I494
Other and unspecified premature depolarisation
I495
Sick sinus syndrome
I509
Heart failure, unspecified
I510
Cardiac septal defect, acquired
I512
Rupture of papillary muscle, not elsewhere classified
I219
Acute myocardial infarction, unspecified
I229
Subsequent myocardial infarction of unspecified site
I234
Rupture of chordae tendineae as current complication following acute myocardial infarction
I240
Coronary thrombosis not resulting in myocardial infarction
I248
Other forms of acute ischaemic heart disease
I250
Atherosclerotic cardiovascular disease, so described
I2510
Atherosclerotic heart disease, of unspecified vessel
I252
Old myocardial infarction
I253
Aneurysm of heart
I514
Myocarditis, unspecified
I515
Myocardial degeneration
Page 4 of 7

ICD code
ICD short description
I520
Other heart disorders in bacterial diseases classified elsewhere
I606
Subarachnoid haemorrhage from other intracranial arteries
I610
Intracerebral haemorrhage in hemisphere, subcortical
I614
Intracerebral haemorrhage in cerebellum
I616
Intracerebral haemorrhage, multiple localised
I258
Other forms of chronic ischaemic heart disease
I260
Pulmonary embolism with mention of acute cor pulmonale
I269
Pulmonary embolism without mention of acute cor pulmonale
I313
Pericardial effusion (noninflammatory)
I328
Pericarditis in other diseases classified elsewhere
I350
Aortic (valve) stenosis
I359
Aortic valve disorder, unspecified
I621
Nontraumatic extradural haemorrhage
I629
Intracranial haemorrhage (nontraumatic), unspecified
I632
Cerebral infarction due to unspecified occlusion or stenosis of precerebral arteries
I634
Cerebral infarction due to embolism of cerebral arteries
I635
Cerebral infarction due to unspecified occlusion or stenosis of cerebral arteries
I64
Stroke, not specified as haemorrhage or infarction
I378
Other pulmonary valve disorders
I38
Endocarditis, valve unspecified
I393
Pulmonary valve disorders in diseases classified elsewhere
I412
Myocarditis in other infectious and parasitic diseases classified elsewhere
I418
Myocarditis in other diseases classified elsewhere
I422
Other hypertrophic cardiomyopathy
I430
Cardiomyopathy in infectious and parasitic diseases classified elsewhere
I440
Atrioventricular block, first degree
I445
Left posterior fascicular block
I458
Other specified conduction disorders
I459
Conduction disorder, unspecified
I460
Cardiac arrest with successful resuscitation
I472
Ventricular tachycardia
I018
Other acute rheumatic heart disease
I500
Congestive heart failure
I513
Intracardiac thrombosis, not elsewhere classified
I517
Cardiomegaly
I518
Other il -defined heart diseases
Page 5 of 7

ICD code
ICD short description
I519
Heart disease, unspecified
I528
Other heart disorders in other diseases classified elsewhere
I600
Subarachnoid haemorrhage from carotid siphon and bifurcation
I051
Rheumatic mitral insufficiency
I081
Disorders of both mitral and tricuspid valves
I083
Combined disorders of mitral, aortic and tricuspid valves
I089
Multiple valve disease, unspecified
I099
Rheumatic heart disease, unspecified
I110
Hypertensive heart disease with (congestive) heart failure
I611
Intracerebral haemorrhage in hemisphere, cortical
I618
Other intracerebral haemorrhage
I638
Other cerebral infarction
I129
Hypertensive kidney disease without kidney failure
I130
Hypertensive heart and kidney disease with (congestive) heart failure
I200
Unstable angina
I220
Subsequent myocardial infarction of anterior wall
I232
Ventricular septal defect as current complication following acute myocardial infarction
I233
Rupture of cardiac wall without haemopericardium as current complication following acute myocardial infarction
I236
Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction
I2511
Atherosclerotic heart disease, of native coronary artery
I2512
Atherosclerotic heart disease, of autologous bypass graft
I2513
Atherosclerotic heart disease, of nonautologous bypass graft
I270
Primary pulmonary hypertension
I272
Other secondary pulmonary hypertension
I308
Other forms of acute pericarditis
I309
Acute pericarditis, unspecified
I311
Chronic constrictive pericarditis
I318
Other specified diseases of pericardium
I319
Disease of pericardium, unspecified
I330
Acute and subacute infective endocarditis
I340
Mitral (valve) insufficiency
I349
Nonrheumatic mitral valve disorder, unspecified
I352
Aortic (valve) stenosis with insufficiency
I362
Nonrheumatic tricuspid (valve) stenosis with insufficiency
I368
Other nonrheumatic tricuspid valve disorders
I369
Nonrheumatic tricuspid valve disorder, unspecified
Page 6 of 7

ICD code
ICD short description
I370
Pulmonary valve stenosis
I372
Pulmonary valve stenosis with insufficiency
I391
Aortic valve disorders in diseases classified elsewhere
I392
Tricuspid valve disorders in diseases classified elsewhere
I398
Endocarditis, valve unspecified, in diseases classified elsewhere
I400
Infective myocarditis
I408
Other acute myocarditis
I409
Acute myocarditis, unspecified
I410
Myocarditis in bacterial diseases classified elsewhere
I420
Dilated cardiomyopathy
I428
Other cardiomyopathies
I431
Cardiomyopathy in metabolic diseases
I441
Atrioventricular block, second degree
I442
Atrioventricular block, complete
I446
Other and unspecified fascicular block
I450
Right fascicular block
I456
Pre-excitation syndrome
I484
Atypical atrial flutter
I492
Junctional premature depolarisation
I498
Other specified cardiac arrhythmias
I602
Subarachnoid haemorrhage from anterior communicating artery
I603
Subarachnoid haemorrhage from posterior communicating artery
I605
Subarachnoid haemorrhage from vertebral artery
I607
Subarachnoid haemorrhage from intracranial artery, unspecified
I608
Other subarachnoid haemorrhage
I612
Intracerebral haemorrhage in hemisphere, unspecified
I613
Intracerebral haemorrhage in brain stem
I615
Intracerebral haemorrhage, intraventricular
I619
Intracerebral haemorrhage, unspecified
I620
Subdural haemorrhage (acute)(nontraumatic)
I630
Cerebral infarction due to thrombosis of precerebral arteries
I631
Cerebral infarction due to embolism of precerebral arteries
I636
Cerebral infarction due to cerebral venous thrombosis, nonpyogenic
Page 7 of 7

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